The first part of the book explained the origin and evolution of the universe itself, in terms derived from the Hindu concept 
of cyclical development. The world and everything in it is supposed to alternate between periods of activity (manvantaras) and 
periods of passivity (pralayas). Each manvantara lasts many millions of years and consists of a number of Yugas, in accordance 
with Hindu cosmology. Blavatsky attempted to demonstrate that the discoveries of "materialist" science had been anticipated in 
the writings of ancient sages, and that materialism would be proven wrong.
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