I read with interest two articles on Rocky Mountain spotted or "tick" fever inThe Journal, July 7, 1906. This fever exists in Nevada, but cases do not seem to be so numerous or so fatal as those occurring in Idaho, Utah and Montana. Here they occur almost, if not exclusively, among sheep-herders, so I am somewhat surprised that Dr. H. N. Mayo does not even mention this class, though they are plentiful in the states named. About three years ago my first patient with "tick" fever came to me. I did not recognize the condition as such, hence can not say whether the patient, a sheepman, had been bitten by atick. The infection was severe and I feared that I would lose the patient. He got up at the end of eight weeks, and recovered slowly thereafter, and in time became entirely well. The treatment in this case was