[Footnote A: Microbes or bacteria of different kinds.]
"As we have already seen, Abbott's experiments prove beyond doubt that attenuated disease-producing organisms, which in healthy animals do not kill immediately, bring about a fatal result when the animal has previously been treated with alcohol. In order to determine which was the most important factor in the destruction or weakening of the resisting agents in the body, Dr. Deléarde conceived the idea of experimenting with those diseases in which it has been found possible to produce, artificially, as it were, and under controlled conditions, an immunity or insusceptibility in healthy animals. He carried out a series of experiments on rabbits, immunizing against and infecting with the virus of hydrophobia, tetanus and anthrax.[B] To these rabbits he first administered a quantity of alcohol, from 6 to 8 c.c. at first, and gradually rises to 10 c.c. doses per diem.
"There is in the first instance a slight falling off in weight of the animal, but after a time this ceases, and the animal may again become heavier, until the original weight is reached. He then took a series of animals and vaccinated them against hydrophobia. In one set the animals were afterwards alcoholized and then injected with a considerable quantity of virulent rabic cord. It was here found that immunity against rabies had not been lost.
"In a second set the vaccination and alcoholization were carried on simultaneously, a fatal dose (as proved by control experiment) of rabic cord was then injected, when it was found that little or no immunity had been acquired. In a third series the alcohol was stopped before the immunizing process was commenced. In this case marked immunity was acquired.
"As regards rabies, then, acute alcoholism, especially when continued for comparatively short periods, simply has the effect of preventing the acquisition of immunity when alcohol is administered during the period when the immunizing process ought to be going on. This indicates that the action of the alcohol in acute alcoholism is direct, and that although its administration prevents the acquisition of immunity it does not alter the cells so materially that they cannot regain some of their original powers, whilst once the immunity has been gained by the cells, alcohol cannot, immediately, so fundamentally alter them that they lose the immunity they have already acquired. When we come to the consideration of the case of tetanus, however, we are carried a step further. Dr. Deléarde repeating his immunizing and alcoholizing experiments, but now working with tetanus virus in place of rabic virus, found--and, perhaps, here it may be as well to give his own words:--