Endorsing the book "Lokayata" Joseph Needham wrote: "Your book will have a truly treasured place on my shelves. It is truly extraordinary that we should have approached ancient Chinese and ancient Indian civilisations with such similar results..." About Chattopadhayay's 1977 book, "Science and Society in Ancient India", he said: "I feel that you have entirely proved your case that the Caraka-samhita and the Susruta-samhita have an ambiguous character, which, when dissected, reveals the intense struggle between the theological philosophers on the one hand, and the doctors who strove for a truly scientific view of the world, on the other. It is unmistakably a chapter in the 'warfare of science with religion'...I do feel that your philological and philosophical analysis has been here a really splendid contribution."