shop coat is almost always torn off in the rough handling i t gets. I t costs more t o get on a coat of paint in the shop t h a n it doe5 in t h e field. Linseed oil gives protection for four or five months, which is as long as i t is wanted, and has given very good results except in one or two cases. FIFTH AVENUE The saltpeter method described b y me in t h e M a y (1914) issue of t h e Journal of Infectious Diseases and in a paper presented a t t h e last December meeting of t h e American

more »

... lic Health Association ( A m . J . Pub. Health, April, 1915) is based upon experimental work with domestic sewage and polluted river water. Briefly, t h e method depends upon t h e denitrification of a sodium nitrate solution by t h e sewage bacteria present.