Western physicians are offered an unusual opportunity for study of Rocky Mountain spotted fever, one not commonly extended their colleagues in other sections of the country. Since identification of the first cases of the disease in the East shortly more than a decade ago, tick fever has stimulated additional interest among members of the profession from year to year because of the apparent rapid dissemination throughout our nation. Those in practice elsewhere are for the most part unfamiliar with manifestations of the disease. There is a distinct obligation to furnish them with accurate information regarding it. The subject of tick fever is an extensive one. No attempt should be made in a single article to deal with its numerous phases but rather to select those of major importance and to present material for further thought and consideration on a disease entity which can in time assume proportions of grave national