The Positive Sciences of the Ancient Hindus c4.s6.26.2

c4.s6.26.2

तस्य दर्शनस्पर्शन-ग्राह्यस्य योग्यानुपलम्भबाधितत्वात् अतादृशस्य तेजोमात्रस्य निवृत्तेरशक्यत्वात् अनिष्टत्वात् च।—Udayana, Kiranávalí, सृष्टिसंहारविधिनिरूपणम्।) Similarly it is under this solar heat that the unripe mango ripens, *i.e.* changes colour, taste, smell, etc., showing that there is chemical transformation or subtile decomposition and recomposition going on; and this is also the case with the rusting of the metals, which is a combustion due to the solar heat (सूर्य्यपाक) even as the conversion of food into chyle and of chyle into blood are instances of chemical action due to the internal animal heat (जठरानल or औदर्य्यं तेजः). But the kind of contact with heat-corpuscles, in other words, the kind of chemical action (पाक) which transforms colours, is supposed to differ from that which transforms flavour (विलक्षणतेजःसंयोग and पाक), and this last from that which produces a change of smell, or tactile quality. (पाको नाम विजातीयतेजःसंयोगः। स च नानाजातीयः। रूपजनको विजातीयतेजःसंयोगस्तदपेक्षया रसजनको विजातीयः। एवं स्पर्शदौ अपि तथा। एवंप्रकारेण भिन्नभिन्नजातीयाः पाकाः कार्य्यवैलक्षण्येन कल्पनीयाः। तथाहि तृणपुञ्जनिक्षिप्ताम्रादौ उष्णालक्षणविजातीयतेजःसंयोगात् पूर्वेहरितरूपनाश रूपान्तरस्य पीतादेरुत्पत्तिः पूर्वरसस्य चाम्लस्यैवानुभवात्। क्वचित् पूर्वेहरितरूपसत्त्वेऽपि रसपरावृत्तिर्दृश्यते विजातीयतेजःसंयोगरूपपाकवशात् पूर्वेतनार्सरसनाशे मधुररसस्यानुभवात्।