Buddha, it will be observed, answered no questions. He left the insoluble alone. He simply preached that holiness meant peace and love, that peace and love meant pure earthly happiness. So, even while they accepted the morality of Buddhism, and acquiesced in its negation, the keener speculative minds were still busy trying to find some key to fit the Great Lock. The Yoga system of philosophy followed on the Sankhya, the Nyaya and the Vaisasika on the Yoga; finally, the two Mimamsa or Vedanta philosophies. Of these the Yoga is merely a repetition, with some alteration, of the Sankhya; the Nyaya--which is to the Hindu what the Aristotelian system was to the Greek, and which is still the school of logic--finds its complement in the scientific and atomic theories of the Vaisasika. This last, which is the first effort made in India to enquire into the laws of physics, is curiously provocative of thought. A Rip-van-Winklish feeling creeps into the mind as the eyes read that all material substances are aggregates of atoms, that the ultimate atom must be simple, that the mote visible in the sunbeam, though the smallest perceptible object, must yet be a substance, therefore a thing composed of things smaller than itself. Once again the question arises, "How much further have we gone towards solution?" Of the Vedanta system enough has already been said. It is pure Monism, matter being but a manifestation of the Supreme Energy, the Supreme Soul, the Supreme Self which comprises all things, holds all things, is all things. So much for the speculative thought of this remarkable age. But when we turn to other subjects, we find the same truly marvellous acumen displayed in almost every field of enquiry. Panini, whom Max Muller called the greatest grammarian the world has ever seen, lived in the middle of this millennium, and by resolving Sanskrit to its simple roots, paved the way for the Science of Languages. It is strange, indeed, to think of him in the dawn of days discovering what was to be rediscovered more than two thousand years afterwards, and adopting half the philological formulas of the present century. So with geometry, a science which certainly developed from the strict rules concerning the erection of altars, as the science of phonetics grew from the study necessary to ensure absolutely accurate intonations of the sacred text. Of the former science much is to be found in the Sulva Sûtras; amongst other things, the celebrated theorem that the square of the hypothenuse is equal to the square of the two other sides of a rectangular triangle. This proposition is ascribed by the Greeks to Pythagoras, but it was known in India long before his time, and it is supposed that he learnt it while on his travels, which included Hindustan.