"There is a school of philosophy still in existence of which modern culture has lost sight." In these words Mr. A.P. Sinnett began his book, _The Occult World_, the first popular exposition of Theosophy, published thirty years ago. [Namely in 1881.] During the years that have passed since then, many thousands have learned wisdom in that school, yet to the majority its teachings are still unknown, and they can give only the vaguest of replies to the query, "What is Theosophy?" We often speak of Theosophy as not in itself a religion, but the truth which lies behind all religions alike. That is so; yet, from another point of view, we may surely say that it is at once a philosophy, a religion and a science. It is a philosophy, because it puts plainly before us an explanation of the scheme of evolution of both the souls and the bodies contained in our solar system.