Experiments go to prove that an inoculated ass, an animal which is very susceptible to glanders, will be visibly affected in the course of six or seven days. It is, of course, almost impossible to determine the exact date of infection under ordinary circumstances, and there is also to be taken into account the question of susceptibility; but altogether the evidence which has been obtained by very careful enquiry leads to the conclusion that when the infective material is introduced into a horse's system through the breathing organs, or an open wound in any part of the body, the disease in some stage will be developed in the course of a few days. It may, however, remain in an absolutely dormant condition for months or years, and during this time, although the animal is to all intents and purposes a glandered horse, there may not be any external evidence whatever of the existence of the disease. It is consequently easy to understand authorities having expressed various opinions in reference to the incubative period.