Skip to content

२५. शिरोरोगविज्ञानीयाध्यायः

Adhikarana १ (१-४) · Śloka ४

अथातः शिरोरोगविज्ञानीयमध्यायं व्याख्यास्यामः ||१|| यथोवाच भगवान् धन्वन्तरिः ||२|| शिरो रुजति मर्त्यानां वातपित्तकफैस्त्रिभिः | सन्निपातेन रक्तेन क्षयेण क्रिमिभिस्तथा ||३|| सूर्यावर्तानन्तवातार्धावभेदकशङ्खकैः | एकादशप्रकारस्य लक्षणं सम्प्रवक्ष्यते ||४||

Meaning of the śloka

Now the chapter on the knowledge of diseases of the head is explained, as taught by Bhagavān Dhanvantari. The head may be afflicted through vāta, pitta, or kapha separately; through their combined involvement; through rakta, depletion, or kṛmi; and through sūryāvarta, anantavāta, ardhāvabhedaka, and śaṅkhaka. The characteristics of these eleven types will be described.

🔊 Audio coming soon

Show commentary

तानेव शिरोरोगान् सङ्ख्यया आह- शिरो रुजतीत्यादि| त्रिभिरिति पृथगर्थद्योतनार्थम्| ‘शिरो रुजति मर्त्यानाम्’ इत्यत्र केचित् ‘शिरोरोगा मनुष्याणाम्’ इति पठन्ति| रोगशब्दो यद्यपि सामान्यव्याधिवाचकस्तथाऽपि ये पीडाकरा व्याधयस्तेऽत्र गृह्यन्ते, तेन खालित्यादीनामत्रानुपादानमिति व्याख्यानयन्ति| एकादशप्रकारस्येत्यादि| एकादशैवात्र शिरोरोगाः| अन्यतोवातशब्देन अनन्तवातस्य सर्वगतनयनरोगविज्ञानीये प्रोक्तत्वात्| ब्रह्मदेवस्तु विदेहादिषु अनन्तवातस्य पृथक् पाठात् पृथगेवात्र पठनीयः, तेन चैकादश शिरोरोगा इति ब्रूते| अत्र केचिद्विदेहदर्शनात् सूर्यावर्तकविपर्ययमपि पठन्ति| तथा च तद्वचः- “तत्र वातानुगं पित्तं चितं शिरसि तिष्ठति| मध्याह्ने तेजसाऽर्कस्य तद्विवृद्धं शिरोरुजम्|| करोति पैत्तिकीं घोरां संशाम्यति दिनक्षये| अस्तं गते प्रभाहीने सूर्ये वायुर्विवर्धते|| पित्तं शान्तिमवाप्नोति ततः शाम्यति वेदना| एष पित्तानिलकृतः सूर्यावर्तविपर्ययः”- इति| केचित्सुश्रुताध्यायिनोऽनेन पाठेन सूर्यावर्तकविपर्ययं पठन्ति,- “वातपित्तात् पुरोजाता रुजाऽपैत्यपराह्णतः| सूर्यावर्तः स तु प्रोक्तो विपरीते विपर्ययः”- इति| असौ सूर्यावर्तविपर्ययश्चातुर्थिकविपर्ययवदसूत्रितोऽपि गृह्यते| अत्र केचित् “आलुञ्चयते कम्पति चापि मूर्धा सर्पन्ति मध्ये च पिपीलिका वा| स्कन्धः शिरश्चाप्यवघूर्णते च मूर्च्छा प्रलापश्च तथैव निद्रा|| सञ्ज्ञाप्रणाशं जनयेद्विनिद्रां प्रातस्ततः पश्यति चातिचित्रम्| गृह्णाति मन्ये हृदयं च रूपैः सर्वैरमीभिः समभिद्रुतस्तु|| तिस्रो हि रात्रीर्न स जातु जीवेत्तं शीर्षकं सम्प्रवदन्ति रोगम्”- इति पठन्ति| स च निबन्धकारैर्नाङ्गीकृतः||१-४||

Meaning of the commentary

The commentary says this passage enumerates the diseases of the head. The word ‘three’ indicates vāta, pitta, and kapha acting separately. Some read ‘diseases of the head in human beings’ instead of ‘the head of mortals is afflicted.’ Although roga can denote disease generally, the commentator explains that the present list concerns painful disorders, which is why conditions such as khālitya are omitted. The count is eleven. One interpretation treats anantavāta as included under anyatovāta because it was already described in the section on diseases affecting the whole eye; Brahmadeva, relying on its separate reading in authorities such as Videha, counts it separately while retaining eleven disorders. Some authorities additionally read sūryāvarta-viparyaya: accumulated pitta accompanied by vāta is said to produce severe pain around midday that subsides as the day ends, while another reading defines it through pain arising before midday and disappearing in the afternoon, with the reverse pattern called viparyaya. Although not stated in the root aphorism, it is accepted by analogy with cāturthika-viparyaya. Another transmitted passage describes a condition called śīrṣaka, with pulling and trembling of the head, crawling sensations, whirling of the shoulders and head, fainting, delirium, sleep disturbance, loss of awareness, unusual morning visions, and cardiac distress, said to be fatal within three nights; the compilers do not accept this condition in the present classification.

Key terms

shiroroga (śiroroga)
A painful disorder of the head in the classification introduced here.
sUryAvarta (sūryāvarta)
One of the named head-disease categories, associated in the cited interpretation with a daily temporal pattern of pain.
anantavAta (anantavāta)
A named category whose separate inclusion is debated in the commentary.
ardhAvabhedaka (ardhāvabhedaka)
One of the eleven classical categories of head disease.
sha~gkhaka (śaṅkhaka)
One of the named classical categories of head disease.

Adhikarana २ (५) · Śloka ५

यस्यानिमित्तं शिरसो रुजश्च भवन्ति तीव्रा निशि चातिमात्रम् | बन्धोपतापैश्च भवेद्विशेषः शिरोभितापः स समीरणेन ||५||

Meaning of the śloka

When intense pain of the head occurs with little apparent cause and becomes excessive at night, and when binding and warmth bring marked relief, that head affliction is attributed to vāta.

🔊 Audio coming soon

Show commentary

इदानीं वातिकशिरोरोगलक्षणमाह- यस्येत्यादि| अनिमित्तम् ईषत्कारणम्| तीव्रवचनात् पित्ते मध्याः रुजो, मध्यः कफे इति बुध्यते| विशेष उपशमः| शिरोभितापः शिरोरोगः||५||

Meaning of the commentary

The commentary identifies these as the signs of vātika head disease. Animitta is explained as a slight or minimal cause rather than absolutely no cause. From the explicit description of the pain here as intense, the commentator infers that pain is of an intermediate degree in pitta and milder in kapha. Viśeṣa means relief, and śirobhitāpa means a disease of the head.

Key terms

vAtika shiroroga (vātika śiroroga)
A head disorder attributed in this passage to vāta.
animitta
Explained by the commentary as arising from a slight or minimal apparent cause.
bandha
Binding, described as bringing relief in this classical pattern.
upatApa (upatāpa)
Application of warmth, described as bringing relief.

Adhikarana ३ (६) · Śloka ६

यस्योष्णमङ्गारचितं यथैव दह्येत धूप्येत शिरोक्षिनासम् | शीतेन रात्रौ च भवेद्विशेषः शिरोभितापः स तु पित्तकोपात् ||६||

Meaning of the śloka

When the head, eyes, and nose feel as though they are burning and smoking like a heap of hot embers, and there is marked relief from cold and during the night, that head affliction is attributed to aggravated pitta.

🔊 Audio coming soon

Show commentary

पैत्तिकशिरोरोगलक्षणमाह- यस्येत्यादि||६||

Meaning of the commentary

The commentary states that this verse gives the characteristics of paittika head disease and adds no further explanation.

Key terms

paittika shiroroga (paittika śiroroga)
A head disorder attributed in this passage to aggravated pitta.
dahyeta
A sensation described as burning.
dhUpyeta (dhūpyeta)
A sensation described as if smoke or heat were rising through the head, eyes, and nose.
shIta (śīta)
Cold, described as providing relief in this pattern.

Adhikarana ४ (७) · Śloka ७

शिरोगलं यस्य कफोपदिग्धं गुरु प्रतिष्टब्धमथो हिमं च | शूनाक्षिकूटं वदनं च यस्य शिरोभितापः स कफप्रकोपात् ||७||

Meaning of the śloka

When the head and throat seem coated with kapha, and feel heavy, stiff, and cold, while the regions around the eyes and the face are swollen, that head affliction is attributed to aggravated kapha.

🔊 Audio coming soon

Show commentary

कफजशिरोरोगलक्षणमाह- शिरोगलमित्यादि| उपदिग्धम् उपलिप्तं, गुरु भारिकं, प्रतिष्टब्धम् अप्रचलितरूपमिव, हिमं शीतपूर्णमिव| शिरोभितापः शिरोरोगः| अत्रानुक्तोऽपि विपर्यय सेवयोपशमो गृह्यते| ‘शिरोगलं’ इत्यत्र ‘शिरोभवं’ इति केचित् पठन्ति||७||

Meaning of the commentary

The commentary identifies these as the signs of kaphaja head disease. Upadigdha means coated or smeared, guru means heavy, pratiṣṭabdha means as though immobile or stiff, and hima means as though filled with cold. Śirobhitāpa denotes a head disease. Although not explicitly stated, relief through measures having opposite qualities is understood. Some read śirobhava, ‘arising in the head,’ in place of śirogala, ‘head and throat.’

Key terms

kaphaja shiroroga (kaphaja śiroroga)
A head disorder attributed in this passage to aggravated kapha.
upadigdha
Coated or smeared, describing the sensation in the head and throat.
pratiShTabdha (pratiṣṭabdha)
Stiff or as though unable to move freely.
shUnAkShikUTa (śūnākṣikūṭa)
Swelling in the region around the eyes.

Adhikarana ५ (८) · Śloka ८

शिरोभितापे त्रितयप्रवृत्ते सर्वाणि लिङ्गानि समुद्भवन्ति |८|

Meaning of the śloka

In a head affliction arising from the combined activity of the three doṣas, all the signs described for them appear together.

🔊 Audio coming soon

Show commentary

सान्निपातिकशिरोरोगलक्षणमाह- शिरोभितापे इत्यादि|८|-

Meaning of the commentary

The commentary identifies this as the characteristic of sānnipātika head disease: the signs of all three doṣas occur together.

Key terms

sAnnipAtika shiroroga (sānnipātika śiroroga)
A head disorder attributed to the combined involvement of vāta, pitta, and kapha.
tritaya
The triad of vāta, pitta, and kapha referred to in this context.
li~gga (liṅga)
A characteristic sign or feature of a disorder.

Adhikarana ६ (८) · Śloka ८

रक्तात्मकः पित्तसमानलिङ्गः स्पर्शासहत्वं शिरसो भवेच्च ||८||

Meaning of the śloka

The rakta-associated disorder of the head has signs similar to the pitta-associated form, together with an inability to tolerate touch on the head.

🔊 Audio coming soon

Show commentary

रक्तजशिरोरोगलक्षणमाह- रक्तात्मक इत्यादि| पित्तजशिरोरोगद्रक्तजे स्पर्शासहत्वमधिकम्||८||

Meaning of the commentary

The commentary identifies the features of raktaja head disease. It states that, compared with the pittaja form, intolerance of touch is an additional feature in the raktaja condition.

Key terms

raktAtmaka (raktātmaka)
A condition characterized in the classical framework by rakta.
pittasamAnali~gga (pittasamānaliṅga)
Having signs similar to those of the pitta-associated form.
sparshAsahatva (sparśāsahatva)
Inability to tolerate touch or marked tenderness of the head.

Adhikarana ७ (९) · Śloka १०

वसाबलासक्षतसम्भवानां शिरोगतानामिह सङ्क्षयेण | क्षयप्रवृत्तः शिरसोऽभितापः कष्टो भवेदुग्ररुजोऽतिमात्रम् ||९|| संस्वेदनच्छर्दनधूमनस्यैरसृग्विमोक्षैश्च विवृद्धिमेति |१०|

Meaning of the śloka

When substances associated with vasā, balāsa, and injury, situated in the head, become depleted, a depletion-origin disorder of the head develops. It is difficult, causes extremely severe pain, and becomes worse through fomentation, emesis, medicinal smoke, nasya, and bloodletting.

🔊 Audio coming soon

Show commentary

क्षयजशिरोरोगस्य लिङ्गमाह- वसेत्यादि| वसाशब्द उपलक्षणार्थः; तेन देहस्नेहमस्तिष्कमेदोमज्जाशुक्राणि गृह्यन्ते| ‘वसाबलासक्षतसम्भवानां’ इत्यत्र केचित् ‘असृग्वसाश्लेष्मसमीरणानां’ इति पठन्ति; तन्नेच्छति गयी||९||-

Meaning of the commentary

The commentary explains the signs of kṣayaja head disease. The word vasā is representative and includes the body's unctuous constituents, the fatty substance of the brain, medas, majjā, and śukra. It also records another reading, ‘asṛk, vasā, śleṣman, and samīraṇa,’ but states that Gayī does not accept that reading. The supplied commentary ends after verse 9 and does not separately explain the treatment-related line that follows.

Key terms

kShayaja shiroroga (kṣayaja śiroroga)
A classical head disorder attributed here to depletion.
vasA (vasā)
Used representatively by the commentator for several unctuous or sustaining bodily constituents.
abhitApa (abhitāpa)
Severe distress or painful affliction of the head.
asRugvimokSha (asṛgvimokṣa)
Historical bloodletting, listed among measures said to aggravate this condition.

Adhikarana ८ (१०) · Śloka ११

निस्तुद्यते यस्य शिरोऽतिमात्रं सम्भक्ष्यमाणं स्फुटतीव चान्तः ||१०|| घ्राणाच्च गच्छेत्सलिलं सरक्तं शिरोभितापः कृमिभिः स घोरः |११|

Meaning of the śloka

When the head is pierced by excessive pain and seems as though it is being eaten away or splitting within, and watery discharge mixed with blood flows from the nose, the text describes this terrible affliction of the head as caused by kṛmi.

🔊 Audio coming soon

Show commentary

कृमिकृतशिरोरोगलक्षणमाह- निस्तुद्यते इत्यादि| निस्तुद्यते शूल्यते व्यथ्यत इत्यर्थः| स्फुटतीव शीर्यत इव||१०||-

Meaning of the commentary

The commentary introduces the signs of a kṛmi-caused head disorder. It explains nistudyate as being pierced, stabbed, or distressed by pain, and sphuṭatīva as feeling as though the head were breaking apart or disintegrating.

Key terms

kRumikRuta shiroroga (kṛmikṛta śiroroga)
A head disorder attributed to kṛmi in the classical account.
nistudyate
A piercing, stabbing, or intensely distressing pain.
sphuTatIva (sphuṭatīva)
A sensation as though the inside of the head were splitting or breaking apart.
salilaM saraktam (salilaṃ saraktam)
Watery nasal discharge mixed with blood.

Adhikarana ९ (११-१२) · Śloka १३

सूर्योदयं या प्रति मन्दमन्दमक्षिभ्रुवं रुक् समुपैति गाढम् ||११|| विवर्धते चांशुमता सहैव सूर्यापवृत्तौ विनिवर्तते च | शीतेन शान्तिं लभते कदाचिदुष्णेन जन्तुः सुखमाप्नुयाच्च ||१२|| तं भास्करावर्तमुदाहरन्ति सर्वात्मकं कष्टतमं विकारम् |१३|

Meaning of the śloka

A pain affecting the eye and eyebrow region begins mildly around sunrise, becomes intense, increases along with the sun, and subsides when the sun sets. At times it is relieved by cold, while at other times the person obtains comfort from warmth. This is called bhāskarāvarta, described as a very difficult disorder involving all doṣas.

🔊 Audio coming soon

Show commentary

सुर्यावर्तमाह- सूर्योदयमित्यादि| सूर्यापवृत्तौ सूर्यास्तसमये| कस्मात्प्रवृत्तिनिवृत्ती भवत इति प्रतिपादयन् निमिराह,- “स्वभावशीता तमसोऽभिमूला रात्रिस्तयोद्भूतकफेन मार्गे| रुद्धे मरुत्कोपमियात् प्रभाते रुजं करोत्यत्र शिरोभितापे|| मध्याह्नसूर्यातपतापयोगात् कफे विलीने मरुति प्रपन्ने| स्वमार्गमायाति तदा दिनान्ते प्रशान्तिमावर्त इहार्कपूर्वे” इति| सूर्यातपविलीनमस्तुलुङ्गकारणोत्पन्नसूर्यावर्त इति दृढबलाचार्यः| ‘उष्णेन जन्तुः सुखमाप्नुयाच्च’ इति पाठात्सूर्यावर्तविपर्ययः कथितो बोद्धव्यः| केचिदत्र ‘आवर्तसञ्ज्ञः स च सूर्यपूर्वोव्याधिर्मतः पित्तसमीरणाभ्याम्’ इति पठन्ति||११-१२||-

Meaning of the commentary

The commentary explains sūryāpavṛtti as sunset. Quoting Nimi, it accounts for the daily onset and remission as follows: the naturally cool night produces kapha that obstructs the pathway, leading vāta to become aggravated at daybreak and cause head pain; with the midday heat, kapha liquefies and vāta regains its pathway, so the condition settles by evening. Dṛḍhabala instead attributes sūryāvarta to the effect of sunlight melting mastuluṅga. The reading that warmth may give comfort is taken to imply a reverse form of sūryāvarta. Another transmitted reading calls the disorder āvarta, preceded by ‘sūrya,’ and attributes it to pitta and vāta. These explanations and readings remain distinct.

Key terms

bhAskarAvarta (bhāskarāvarta)
The head-pain pattern described as increasing with the sun and subsiding at sunset.
akShibhruvaM ruk (akṣibhruvaṃ ruk)
Pain in the region of the eye and eyebrow.
sUryApavRutti (sūryāpavṛtti)
Sunset, according to the commentary.
sarvAtmaka (sarvātmaka)
Involving all doṣas in this classical classification.
sUryAvartaviparyaya (sūryāvartaviparyaya)
A reverse pattern inferred by the commentator from the reading concerning relief with warmth.

Adhikarana १० (१३-१४) · Śloka १५

दोषास्तु दुष्टास्त्रय एव मन्यां सम्पीड्य घाटासु रुजां सुतीव्राम् ||१३|| कुर्वन्ति साक्षिभ्रुवि शङ्खदेशे स्थितिं करोत्याशु विशेषतस्तु | गण्डस्य पार्श्वे तु करोति कम्पं हनुग्रहं लोचनजांश्च रोगान् ||१४|| अनन्तवातं तमुदाहरन्ति दोषत्रयोत्थं शिरसो विकारम् |१५|

Meaning of the śloka

When all three doṣas become aggravated, they compress the manyā region and produce extremely severe pain in the ghāṭā regions. The pain quickly becomes established around the eyes and eyebrows and especially at the temples. It also causes trembling beside the cheek, restriction of the jaw, and disorders arising in the eyes. This disorder of the head, produced by all three doṣas, is called anantavāta.

🔊 Audio coming soon

Show commentary

अनन्तवातमाह- दोषास्तु दुष्टास्त्रय इत्यादि| सात्यकिप्रभृतिभिस्तु शिरःकम्परोगोऽसाध्यः पठितः; अस्मिंस्तु शास्त्रे सान्निपातिकशिरोरोगोऽनन्तवात एवान्तर्भवति||१३-१४||-

Meaning of the commentary

The commentary introduces the description of anantavāta. It notes that Sātyaki and other authorities describe a disorder marked by trembling of the head as incurable. In this treatise, however, the sannipātika disorder of the head is included within anantavāta.

Key terms

anantavAta (anantavāta)
The head disorder described here as arising from the combined aggravation of all three doṣas.
doShatrayottha (doṣatrayottha)
Arising from all three doṣas.
manyA (manyā)
The neck or nape region said to be compressed in this account.
hanugraha
Restriction or stiffness of the jaw.

Adhikarana ११ (१५) · Śloka १६

यस्योत्तमाङ्गार्धमतीव जन्तोः सम्भेदतोदभ्रमशूलजुष्टम् ||१५|| पक्षाद्दशाहादथवाऽप्यकस्मात्तस्यार्धभेदं त्रितयाद्व्यवस्येत् |१६|

Meaning of the śloka

When one half of a person's head is afflicted by very severe splitting pain, pricking pain, giddiness, and aching, occurring after a fortnight, after ten days, or suddenly, it should be identified as ardhāvabheda arising from the three doṣas.

🔊 Audio coming soon

Show commentary

अर्धावभेदमाह- यस्योत्तमेत्यादि| ‘तस्यार्धभेदं पवनात् सपित्तात्’ इति केचित् ‘त्रितयाद्व्यवस्येत्’ इत्यत्र ‘द्वितयात्’ इति वा पाठः||१५||-

Meaning of the commentary

The commentary introduces ardhāvabheda and preserves textual alternatives. Some read the line as stating that the condition arises from vāta together with pitta. Another reading has ‘from two’ in place of ‘from three.’ These readings leave the stated doṣic attribution variant-dependent.

Key terms

ardhAvabheda (ardhāvabheda)
A classical head disorder characterized here by severe symptoms affecting one half of the head.
sambheda
A splitting or bursting quality of pain.
toda
A pricking quality of pain.
bhrama
Giddiness or a sensation of disorientation in this symptom list.

Adhikarana १२ (१६-१८) · Śloka १८

शङ्खाश्रितो वायुरुदीर्णवेगः कृतानुयात्रः कफपित्तरक्तैः ||१६|| रुजः सुतीव्राः प्रतनोति मूर्ध्नि विशेषतश्चापि हि शङ्खयोस्तु | सुकष्टमेनं खलु शङ्खकाख्यं महर्षयो वेदविदः पुराणाः ||१७|| व्याधिं वदन्त्युद्गतमृत्युकल्पं भिषक्सहस्रैरपि दुर्निवारम् ||१८||

Meaning of the śloka

Vāyu lodged in the temple region, with greatly increased force and accompanied by kapha, pitta, and rakta, spreads extremely severe pain through the head, particularly in both temples. The ancient seers learned in the Veda call this very grave disorder śaṅkhaka. They describe it as comparable to approaching death and difficult to arrest even by a thousand physicians.

🔊 Audio coming soon

Show commentary

शङ्खकलक्षणमाह- शङ्खाश्रित इत्यादि| कृतानुयात्रः कृतानुगमः| उद्गतमृत्युकल्पः उपस्तितमृत्युसमः| एष व्याधिस्तु त्र्यहान्मारयति, त्र्यहादनन्तरं कुशलेनोपक्रान्तः सिध्यति||१६-१८||

Meaning of the commentary

The commentary introduces the defining features of śaṅkhaka. It explains kṛtānuyātra as ‘having been followed or accompanied’ and udgatamṛtyukalpa as ‘like imminent death.’ It then states that the disease kills within three days, while also saying that when treatment is begun by a skilled practitioner after three days it succeeds. The timing in these statements appears difficult to reconcile and requires review rather than silent harmonization.

Key terms

sha~gkhaka (śaṅkhaka)
The grave classical head disorder centered especially in the temple regions.
sha~gkha (śaṅkha)
The temple region of the head.
kRutAnuyAtra (kṛtānuyātra)
Explained by the commentary as having been followed or accompanied, here by kapha, pitta, and rakta.
udgatamRutyukalpa (udgatamṛtyukalpa)
Explained as being comparable to imminent or approaching death.

Adhikarana पुष्पिका · Śloka २५

इति सुश्रुतसंहितायामुत्तरतन्त्रान्तर्गते शालाक्यतन्त्रे शिरोरोगविज्ञानीयो नाम पञ्चविंशोऽध्यायः ||२५||

Meaning of the śloka

Thus ends the twenty-fifth chapter, entitled ‘Knowledge of Diseases of the Head,’ in the Śālākya-tantra section of the Uttara-tantra of the Suśruta-saṃhitā.

🔊 Audio coming soon

Show commentary

इति श्रीडल्ह(ह्ल)णविरचितायां निबन्धसङ्ग्रहाख्यायां सुश्रुतव्याख्यायामुत्तरतन्त्रान्तर्गते शालाक्यतन्त्रे पञ्चविंशोऽध्यायः||२५||

Meaning of the commentary

Thus ends the twenty-fifth chapter in the Śālākya-tantra section of the Uttara-tantra in the Nibandhasaṅgraha commentary on the Suśruta-saṃhitā, composed by Śrī Dalhaṇa.

Key terms

shirorogavij~jAnIya (śirorogavijñānīya)
The chapter title concerning knowledge or identification of diseases of the head.
shAlAkyatantra (Śālākya-tantra)
The textual section in which this chapter is placed.
uttaratantra (Uttara-tantra)
The division of the Suśruta-saṃhitā containing the chapter.
nibandhasa~ggraha (Nibandhasaṅgraha)
The title of Dalhaṇa's commentary named in the colophon.