The use of raw milk was forbidden in the army, and condensed milk was issued instead. Sometimes "blown" cans of this were sent in for examination and found to be infected with gas producing organisms. Whenever such occurred, the report would be forwarded back through the system to England and the manufacturer would be apprised of the fact and checked up on his methods. Canned foods of various sorts were also brought in for examination, but nothing of a harmful character ever discovered. The food supply of the British Army, as a matter of fact, was of the highest quality and had been subjected to rigid examination by the Government inspectors during its preparation; practically none of it was ever found to be bad. Another unusual problem arose out of the fact that several soldiers had contracted anthrax, both in England and in France, and the shaving brushes issued were suspected of being the cause. We undertook to search them for anthrax spores, but found it was too long and tedious a job for a field laboratory, for the brushes were full of spores of all kinds. Later on in England anthrax was actually found by other bacteriologists in some of these brushes, according to reports published. These few examples taken at random will serve to demonstrate the varied character of the work of a field laboratory, and to show that a certain amount of experience is necessary in order to handle some of the problems affectively. We were peculiarly fortunate in our combined experience. Major Rankin, a first rate pathologist and bacteriologist of the government of Alberta, had been in charge of the government laboratory at Siam for five years previous to the war, and knew tropical medicine like a book, while Captain Ellis had carried on research work for three years in the Rockefeller hospital laboratories in New York and was thoroughly conversant with all the most recent work in vaccine and serum therapy. Consequently there was practically nothing that we could not tackle between the three of us, either in bacteriology, pathology, sanitation or treatment of epidemic disease. Wherever an action was about to occur on the front the hospitals were evacuated of all sick and wounded in order to obtain the maximum number of empty beds. Consequently when fighting was going on the hospitals were very busy but the laboratory routine greatly decreased except in hygienic work. We therefore undertook scientific investigations of various kinds to keep busy and be of the maximum use.