Some Notes on American Plumbing,* by F. L. BARROW,M.SC.,A.M.I.C.E.,M.I.STRUCT.E.,A.M.A.S.S.E. (Member). Principal Scientific Officer,Building Research Station (Department of Scientific and Industrial Research)

" Epidemic Amebic Dysentery—The Chicago Outbreak of I933." National Institute of Health Bulletin, No. 166. U.S. Treasury Department.

" Plumbing Cross-Connections and Back-Siphonage Research," by F. M. Dawson and A. A. Kalinske. Iowa City, I938.

"Plumbing in Relation to Public Health." Minnesota State Board of Health 1942.

" Public Health Service Drinking Water Standards, I946." Reprint No. 2697 from Public Health Reports.

" Pollution in the Plumbing," by F. M. Dawson, I939. The Modern Hospital, Vol. 53, No. 6.

" Combating Backflow in Water Supply Systems," by R. H. Zinkil. I939. Journal of the New England Water Works Association, Vol. 53, No. 4.

" Sanitation, Please," by Thomas Farrell, Jun. Plumbing and Heating Business, December, I94I.

" Safe Air Gaps to prevent Back-Siphonage," by. R. H. Zinkil. Proceedings of the American Society of Sanitary Engineering, I936, Annual Meeting.

" Manual on Cross-Connections and Inter-Connections." Committee on Cross-Connection Control; Departments of Health, etc., Los Angeles, I942.

" Air Gaps and Backflow Preventers in Plumbing Systems." American Standards Association. A40.4— 1942, A40.6—1943.

[During the course of this paper, four films illustrating American plumbing practice were shown by Mr. Barrow.]