This little monograph, well printed and illustrated, should be read by those interested in modern public health work, and in the problem of securing healthy surroundings for themselves and their families. It was written following a visit to the Canal Zone, and is a condensed but appreciative review of the work done by Colonel Gorgas and his department in Panama. Even those who are familiar with this epoch-making work must feel a glow of pride after reading the entire story. As the author well says in his closing paragraphs: "May we not congratulate our professional brethren who have so unselfishly devoted their talents and their lives to the service of their country on the great work they have accomplished?... So long as preventable destroying diseases flee before the conquering hosts of efficient sanitation, so long will the labors of these enviable benefactors of the human race be cherished."