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 The demand for them during the War was unprecedented in the history of such manuals.

The House has always had in its list a number of books that aim at the dissemination of hygienic knowledge. So long ago as 1883 it published two large volumes that come into this category—one "The Book of Health," edited by Sir Malcolm Morris, the other "Our Homes and How to Make Them Healthy," of which the editor was Mr. (now Sir) Shirley Murphy, at that time Medical Officer of Health for St. Pancras, afterwards for many years Medical Officer of Health for the London County Council. Contributors whose co-operation was enlisted included some of the most eminent medical men and civil engineers of the day, and both books made their mark. In the 'nineties the House published Sir John Simon's "English Sanitary Institutions," one of the classics of Public Health literature. Of late years it has helped to give publicity to the revelations and recommendations of the Royal Commission on Venereal Diseases, by issuing a book entitled "The Nation's Health: The Stamping Out of Venereal Disease," from the pen of Sir Malcolm Morris, who served on the Commission. Since then it has launched the English Public Health Series, edited by Sir Malcolm, who is the author of the introductory volume, "The Story of English Public Health," which sketches the evolution of our Public Health Service from its beginnings down to the creation of the Ministry of Health. Other notable works in the category of popular hygiene are Dr. Ballantyne's "Expectant Motherhood" and Dr. Woods Hutchinson's "Doctor in War," an animated account of the achievements of medical organization and surgical skill in the great conflict.

Not the least eminent of the social services rendered by the House of Cassell has been the popularization of science. Early in the 'seventies it secured the aid of one who, to a very wide knowledge of science, added a great gift of lucid exposition. He was known as Robert Brown, of