That certain forms of infectious diseases follow closely on tonsillar affection, the same micrococci existing in the former as in the latter, and hence are mentioned as being tonsillar in origin, is to-day an established fact. Some of these facts are well-known, while others, being of rare occurrence, or the study of which is of recent date, have not received due consideration. The writer wishes to briefly present them all in this paper with the hope that subsequent discussion may bring out any additional facts or shed new light thereon. The study of the etiology of disease becomes vitally necessary in that most important field of our work, preventive medicine. The list of diseased states that follow the various forms of angina has become formidable and we should regard the tonsillar affection with the import its existence requires. Regarding the point of entrance of the infection, Hodenpyl 1 showed that