"The motions of the sun and moon were carefully observed by the Hindus and with such success that their determination of the moon's synodical revolution is a much more correct one than the Greeks ever achieved. They introduced the period of Jupiter with those of the sun and moon into the regulation of their calendar in the form of Sixty years common to them and the Chaldeans. They were keenly interested m logic and grammar, and in medicine and surgery they once kept pace with the most enlightened people of the world." 46<>"