Mucous membranes of 497 mouths, etc. Previous to feeding experiment, the animals were kept without food for at least 18-24 hours. Care was also taken to observe whether each animal consumed the whole of the bolus. Those which did not partake of the greater part were set aside, and, if they did not die or develop plague within a month, were killed for post-mortem and bacteriological observation. Subsequent to the feed, the animals were transferred to clean cages and kept under observation. Table No.1 is a record of the main results. Other similar experiments have been made by me during the past few years, and the results were uniform and identical. In addition to each series of these feeding experiments, a healthy guinea pig was inoculated with some of the same material. In every instance, the animal developed typical plague.
Spleens from different cases of human plague were used, but the results produced on guinea pigs...