The doctrines of India first obtained a foothold in Europe through the dogma of Metempsychosis. It was introduced into the Hellenes by Pythagoras; but never became popular among the Greeks. This Metempsychosis (or the transmigration of souls) was believed by the Indians from the earliest period, and their whole history is built upon it. A very ancient connection can be traced between India and Egypt, manifested by Castes, which are found equally in both countries, and by similiar Mythologies. When Alexander the Great invaded Northern India from Persia, the Greeks found an Indian Mythology far more like their own than the Persian or Hebrew. They thought they had met with the same gods they had been accustomed to worship, though clothed in a different form and color. They showed their faith in this discovery by the names of the Indian Hercules and the Indian Bacchus, later so common among them. The worship of Vishnoo and Krishnoo in Hindostan differs very little from the religion of Buddha and Fo which was established in China and Thibet during the first century of Christianity. The former retained caste, while the latter, following the teaching of Buddha, have repudiated any class distinctions. Decimal cyphers originated in Hindostan. PERSIAN. In everything appertaining to their religious belief the Persians bear a close resemblance to the Hebrew, but the poetical part of their mythology is more similiar to the Northern theology, while their manners bear a strong resemblance to the Germans. The spiritual worship of nature, light, fire, and of other pure elements, is embodied in both the Zend Avesta (Persian) and the Edda (Scandinavian). The two nations have the same opinion concerning spirits which rule and fill nature, and this has given rise to poetical fancies about giants, dwarfs and other beings, found equally in Persian and Northern Sagas. The work of Lokman, existing now only in Arabic, has caused some people to think that it is of Arabian origin; but it is really Persian, and of the tenth century B.C. His Apologues are considered the foundation on which Greek fable was reared. The Code of Zoroaster, in which the two great principles of the world are represented by Ormuzd (goodness and light), and Ahriman (darkness and sin) are as old as the creation.