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[ The Seventy two Kalas
PRECIOUS STONES:-By this art people learnt how to determine the value of precious stones; which jewel should be born by a certain man for a particular period of time so that it my prove useful to him; which kind of jewel, when borne upon a particular limb of the body, removed a certain calimity of the bearer; which kind of jewel cooled the effect of an evil spirit from the body immediately; what was the effect of the jewel itself upon the body and mind of the bearer as well as the outside world; which kind of gems were found in a certain land and when they could be obtained in largest numbers most easily. Not only this, but those who were skilled in this art knew how to purify the precious stones and prepare chemicals out of them by using which one could conquer sleep, hunger, and thirst etc. This art also taught which
gem was auspicious for a certain man and which was not. (15) “DHATUVADA” THE ART OF TESTING METALS:
This art taught how to test the purity of different metals, how to know their density and magnitude, which metals were found in a certain climate and in certain land and which kind of soil was able to produce a certain kind of metal on account of its colour, brightness, density, and softness etc; which metal was hard and which was soft; how long wire could be drawn out of different metals of the same measurement; which metals when they came in contact with each other produced electric currents; which metals were required for making utensils, coins, instruments, weapons, ornaments, trunks and machines etc, so that they might be lasting and useful, which metals could remove certain disease from the body when they were
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