It would be a great pleasure to thank, by name, the many persons, both Indian and English, who have so courteously facilitated my access to information, to records, and to those places and things that I desired to see for myself. But the fact that it was impossible to forecast the conclusions I should reach, and that for these conclusions they are in no way responsible, make it improper now to connect them therewith. For this reason the manuscript of this book has not been submitted to any member of the Government of India, nor to any Briton or Indian connected with official life. It has, however, been reviewed by certain public health authorities of international position who are familiar with the Indian field. I may, on the other hand, express my deep indebted~ess to my friends, Miss M. Moyca Newell and Harry Hubert Field, the one for her constant and invaluable collaboration, the other for a helpfulness, both in India and here, beyond either limit or thanks.