It is true ancient India has drawn the attention of a number of scholars than other periods of history, and many valuable studies have been produced. Yet the state of our knowledge of this period is far from satisfactory. Nevertheless, he fills the most serious gap, namely a synoptic view of the social and cultural development of India. There is an unbroken continuity between India of Vedic age and the India of today. For the ancient Indian mind, history was Purana and Ithihasa and the two indicated more or less an identical substance, namely the knowledge which is characterised by fine attributes - Creation, Dissolution, Geneology, Ages of the World and Biography.
History now becomes the knowledge of the infinite world of facts, an infinite whole of thought.
The infinite is within the grasp of human intellect, the intellect which is the faculty of history. Inevitably, each social scientist is particularly sensitive to the lapses or omissions of his predecessors. Primitive cultures and pre-historic societies are those that cover the life of those ages in which man's activity functioned mechanically and without any reasoning or volition on his part and was influenced wholly by his physical environment. A true historical period begins from that point at which social life and man's activity in relation to it become influenced by the inter relation of human wills. Exploration of the Indus Valley sites is an important basic factor for historical studies.