?PREFACE. In presenting this report upon "The Causes of Malaria in Bombay and the Measures Necessary for its Control" I desire to acknowledge the great assistance afforded to me in the work of investigation by the members of the Malaria Investigation Committee. But for the facilities freely granted to me by the Municipal Commissioners Mr. W. D. Sheppard, I. C. S., and Mr. P. R. Cadell, I. C. S., the work of investigation in the City generally would have been impossible; and the cordial help given me by the Honourable Mr. J. P. Orr, I. C. S., Chairman of the City of Bombay Improvement Trust, Mr. W. C. Symes and Mr. A. H. Froom representing the Port Trust and Mr. A. Muirhead and Dr. A. H. Deane representing the G. I. P. and B. B. & C. I. Railway Companies, respectively, lightened the work in special areas to a very great extent. I am greatly indebted also to Dr. J. A. Turner, the Executive Health Officer of Bombay, for much valuable information, for returns regarding sickness and for many specimens of mosquito larvæ collected by officers of the Health Department. My thanks are also due to Colonel W. B. Bannerman, I. M. S., Director, and Major W. G. Liston, I. M. S., Acting Director, of the Bombay Bacteriological Laboratory at Parel, for the facilities placed at my disposal there and for advice and help which has been of the greatest assistance. The work of investigation in areas controlled by the Port Trust was greatly simplified by help afforded to me on many occasions by Mr. P. Glynn Messent, M.I.C.E., Chief Engineer of the Bombay Port Trust, and Dr. S. A. Powell, Chief Medical Officer, and Messrs. Price, Wills and Reeves, the Contractors for the New Dock, granted me every facility for carrying on the enquiry in the New Dock Works. Much of the information given in Part I and Chapter I of Part II of the report was derived from the pages of the recently published Gazetteer of Bom- bay City, and the Administration Reports of the Municipality. A special report by Dr. J. A. Turner, Executive Health Officer, which contained detailed information regarding the anti-malaria measures adopted in the City from time to time, was most useful in drawing up the Chapter on "The History of Malaria Prevention in Bombay." Section 1 of Chapter IV in Part III which deals with "The Cost of Mosquito Prevention in different parts of the World" is largely based upon information derived from Major Ross' recent book on "The Prevention of Malaria" which has also suggested to some extent the general arrangement adopted in this report; and Sir Rupert Boyce's "Mosquito or Man," and "Health Administration in the West Indies" was of assistance in dealing with "The Legal Aspect of Malaria Prevention." Colonel W. C. Gorgas, U. S. A., not only provided the formula for his valuable larvacide, but supplied reprints of a number of his papers dealing with mosquito prevention and they have been freely quoted from in this report. My assistants in the investigation were Assistant Surgeon D. A. Vaz, L.M. & S., and Sub-Assistant Surgeons T. G. Akula and Keshavlal G. Modi, and Mr. J. D. A. Fernandes acted as clerk, and I desire to express my appreciation of their work. During a period of three months from May 1st to August 1910 Dr. R. B. Khambata, D.P.H., was attached to the staff of the investigation and afforded much useful assistance. CHAS. A. BENTLEY. Bombay, April 1911. B 136-a