आयुर्वेद प्रकाश (माधव उपाध्याय - रसशास्त्र, पारद शोधन व धातु भस्म निर्माण सटीक)

letter have a loop on the left?
No, it's open on the left, with a vertical on the right: it's 'ग'!
Wait, so is it "गर्भकः" or "गर्भगः"?
"कर्कोटीकन्दगर्भगः ।"
"गर्भगः" means "situated inside the bulb of Karkoṭī" (garbha-gaḥ)!
Yes! "गर्भगः" makes total grammatical and contextual sense! (situated in the womb/interior of the karkotikanda).
Let's check the meter:
ना-ग-व-ल्ली-र-सै-र्घृ-ष्टः (8)
क-र्को-टी-क-न्द-ग-र्भ-गः (8)
8 + 8 = 16! Exactly: "कर्कोटीकन्दगर्भगः ।"

Line 15:
"मृन्मूषासंपुटे पक्वः सूतो यात्येव भस्मताम् ॥ ४०१ ॥"
Let's check the letters:
मृन्मूषासंपुटे (mṛnmūṣāsaṁpuṭe)
पक्वः (pakvaḥ)
सूतो (sūto)
यात्येव (yātyeva)
भस्मताम् (bhasmatām)
॥ ४०१ ॥
Everything matches!

Line 16:
"अन्यच्च —" (or "अन्यच्च —")
Check: