202 THE ENZYME TREATMENT OF CANCER
Because to do so would take up much space, I refrain from giving an account of the Roberts methods and their results. Possibly in the interests of science—not “medical science “—some of the medical journals may see fit to republish his Royal Society paper. If not, one prominent consulting physician, who has made still further investigations into these matters, may deem it expedient to publish the memoir, which, I believe, he wrote down a few years ago. Briefly, it may be stated that Roberts set up certain tryptic and amylolytic units, in terms of which preparations or injections might be designated. Thus, of the injections used in 1907, practically all those sold by two firms, the one in London, the other in New York, had no greater tryptic strength than 500 Roberts units, while as a rule their amylolytic activities were considerably under 500 units. Some of the injections had not more than 100 units of strength, and the German injections were excessively weak in such units of tryptic strength and possessed no amylolytic powers worth mentioning. Under the newer procedure it has been found best to put up the two ferments, trypsin and amylopsin, in separate ampoules, which I would suggest should be differently coloured. The trypsin injection thus prepared should be as free as possible of amylopsin, and the amylopsin injection should be to all intents free from trypsin. The ampoule of 1 c.c. should contain in this bulk 1,000 units of tryptic activity, and the ampoule of amylopsin should have per ampoule at least 2,000 units of amylolytic activity. Personally, I do not believe that reliance can he placed upon injections containing respec-
(cont. from p201) test,” and it depends upon the time required by milk to reach the coagulation point. It is, in my experience, an extremely delicate test, and free from the objections attaching to the” bitter taste “ test employed in America.