The theory of invasion is an invention. This invention is necessary because of a gratuitous assumption which underlies the Western theory. The assumption is that the Indo-Germanic (sic) people are the purest of the modem representatives of the original Aryan race. Its first home is assumed to have been somewhere in Europe. These assumptions raise a question: how could the Aryan speech have come to India? This question can be answered only by the supposition that the Aryans must have come into India from outside. Hence the necessity for inventing the theory of invasion.