History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c29.s1.3
History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c29.s1.3
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c29.s1.3
Each of these again is divided into four classes, according to its colour; namely, *brahmana, kshatriya, vaisya* and *sudra*. 30