I have great pleasure in introducing National Integration in Historical Perspective-a Cultural Regeneration in Eastern India by Dr. Rabindra Nath Chakraborty, M.A. (Triple), Ph.D. to the reading intelligentsia. The myth of cultural disunity and political diversity of India was harped by the British imperialist writers which assumed a menacing dimension within a period of thirty years after independence of India from the foreign yoke. Despite her stunted capitalist development, India today is on the verge of socio-political disintegration since her numerous ethnic groups each with its glorious heritage are on the breaking point due to its asymmetrical development and regional imbalance. It is high time that our research scholars should direct their attention to discover the essential cultural unity in the Indian way of life under the historical perspective. The object of study in the present work is to explore the trends of unity binding eastern India since geographical location and ethnic settlements had evolved the unity in wet paddy cultivation and bamboo based industry bringing uniformity in the way of life of the people, in their value system and supplying uniformity in the evolution of socio-economic institutions from a long glorious past. Again changes and continuity in agrarian life, in surplus value of labour leading to surplus exchange brought homogeneity in trade and commerce. With this object in view the study was undertaken within the time-frame of the tenth through the sixteenth centuries, viz, within the time-frame of five hundred years.