Many cuts of the original report have been omitted, particularly those illustrat ing plumbing fixtures, as these are con tained in the well known catalogues and circulars of manufacturers of plumbers supplies. The author takes this opportunity to express his obligationsto many friends for valuable hints and suggestions, which he has endeavored to embody in this im proved edition. He would be glad if this little volume should prove to be of ih terest and value to architects, sanitary engineers, plumbers, sanitary officers and householders in general.