Note 1 — Chapter I · VACCINATION AND SMALL-POX

Professor Crookshank, in his evidence before the Royal Commission (4th Report, Q. 11,729) quotes Dr. De Haën, a writer on Inoculation, as saying: “Asthma, consumption, hectic or slow fever of any kind, internal ulcers, obstructed glands, obstructions of the viscera from fevers, scrofula, scurvy, itch, eruptions, local inflammations or pains of any kind, debility, suppressed or irregular menstruation, chlorosis, jaundice, pregnancy, lues venerea, whether in the parent or transmitted to the child, and a constitution under the strong influence of mercury, prevented the operation.” There is no evidence that those who applied the so-called “variolous test” in the early days of vaccination paid any attention to this long list of ailments, many of which were very prevalent at the time, and which would, in the opinion of De Haën, and of the English writer Sanders, who quotes him, have prevented the action of the virus and thus rendered the “test” entirely fallacious. With such causes as these, added to those already discussed, it becomes less difficult to understand how it was that the alleged test was thought to prove the influence of the previous vaccination without really doing so.