[Footnote 2: See Dr B.N. Seal in P.C. Ray's Hindu Chemistry, pp. 190-191, Nyâyamañjarî, p 438, and Udyotakara's Vârttika. There is very little indication in the Nyâya and Vais'e@sika sûtras that they had any of those differences indicated here. Though there are slight indications of these matters in the Vais'e@sika sûtras (VII. 1), the Nyâya sûtras are almost silent upon the matter. A systematic development of the theory of creation and atomic combinations appear to have taken place after Vâtsyâyana.]
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atoms of the same bhûta or of many bhûtas. According to the Nyâya view there are no differences in the atoms of the same bhûta, and all differences of quality and characteristics of the compound of the same bhûta are due only to diverse collocations of those atoms. Thus Udyotakara says (III. i. 4) that there is no difference between the atom of a barley seed and paddy seed, since these are all but atoms of earth. Under the continued impact of heat particles the atoms take new characters. It is heat and heat alone that can cause the transformations of colours, tastes etc. in the original bhûta atoms. The change of these physical characters depends on the colours etc. of the constituent substances in contact, on the intensity or degree of heat and also on the species of tejas corpuscles that impinge on the atoms. Heat breaks bodies in contact into atoms, transforms their qualities, and forms separate bodies with them.
Pras'astapâda (the commentator of Vais'e@sika) holds that in the higher compounds of the same bhûta the transformation takes place (under internal heat) in the constituent atoms of the compound molecules, atoms specially determined as the compound and not in the original atoms of the bhûta entering into the composition of the compound. Thus when milk is turned into curd, the transformation as curd takes place in the atoms determined as milk in the milk molecule, and it is not necessary that the milk molecule should be disintegrated into the atoms of the original bhûta of which the milk is a modification. The change as curd thus takes place in the milk atom, and the milk molecule has not to be disintegrated into k@siti or ap atoms. So again in the fertilized ovum, the germ and the ovum substances, which in the Vais'e@sika view are both isomeric modes of earth (with accompaniments of other bhûtas) are broken up into homogeneous earth atoms, and it is these that chemically combine under the animal heat and biomotor force vâyu to form the germ (kalala). But when the germ plasm develops, deriving its nutrition from the blood of the mother, the animal heat breaks up the molecules of the germ plasm into its constituent atoms, i.e. atoms specifically determined which by their grouping formed the germ plasm. These germ-plasm atoms chemically combine with the atoms of the food constituents and thus produce cells and tissues [Footnote ref 1]. This atomic contact is called ârambhaka-sa@myoga.
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[Footnote 1: See Dr B.N. Seal's Positive Sciences, pp. 104-108, and Nyâyakandalî, pp. 33-34, "S'arîrârambhe paramânava eva kâra@nam na s'ukra-s'onitasannipâta@h kriyâvibhâgâdinyâyena tayorvinâs'e sati utpannapâkajai@h paramâ@nubhirârambhât, na ca s'ukras'onitaparamâ@nûnâ@m kas'cidvis'e@sa@h pârthivatvâvis'e@sât….Pitu@h s'ukra@m mâtuh s'onita@m tayos sannipâtânantara@m ja@tharânalasambandhât s'ukra-s'onitârambhake@su paramâ@nu@su pûrvarûpâdivinâs'e samâ@nagu@nântarotpattau dvya@nukâdikrame@na kalalas'arirotpatti@h tatrântahkara@napraves'o…tatra mâturâhâraraso mâtrayâ sa@mkrâmate, ad@r@s@tavas'âttatra punarja@tharânalasambandhât kalalârambhakaparamâ@nu@su kriyâvibhâgadinyâyena kalalas'arîre na@s@te samutpannapâkajai@h kalalârambhakaparamâ@nubhirad@r@s@tavas'âd upajâtakriyairâhâraparamâ@nitbhi@h saha sambhûya s'arîrântaramârakkyate.".]
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In the case of poly-bhautik or bi-bhautik compounds there is another kind of contact called upa@s@tambha. Thus in the case of such compounds as oils, fats, and fruit juices, the earth atoms cannot combine with one another unless they are surrounded by the water atoms which congregate round the former, and by the infra-atomic forces thus set up the earth atoms take peculiar qualities under the impact of heat corpuscles. Other compounds are also possible where the ap, tejas, or the vâyu atoms form the inner radicle and earth atoms dynamically surround them (e.g. gold, which is the tejas atom with the earth atoms as the surrounding upa@s@tambhaka). Solutions (of earth substances in ap) are regarded as physical mixtures.
Udayana points out that the solar heat is the source of all the stores of heat required for chemical change. But there are differences in the modes of the action of heat; and the kind of contact with heat-corpuscles, or the kind of heat with chemical action which transforms colours, is supposed to differ from what transforms flavour or taste.
Heat and light rays are supposed to consist of indefinitely small particles which dart forth or radiate in all directions rectilineally with inconceivable velocity. Heat may penetrate through the interatomic space as in the case of the conduction of heat, as when water boils in a pot put on the fire; in cases of transparency light rays penetrate through the inter-atomic spaces with parispanda of the nature of deflection or refraction (tiryag-gamana). In other cases heat rays may impinge on the atoms and rebound back—which explains reflection. Lastly heat may strike the atoms in a peculiar way, so as to break up their grouping, transform the physico-chemical characters of the atoms, and again recombine them, all by means of continual impact with inconceivable velocity, an operation which explains all cases of chemical combination [Footnote ref l]. Govardhana a later Nyâya writer says that pâka means the combination of different kinds of heat. The heat that