The present account of what we have styled for convenience's sake Ohara's disease is based on two papers1published in Japanese, reprints of which were kindly sent to one of us by the author, Dr. Ohara of Fukushima, Japan. The first part of our paper presents the epidemiologic, clinical, bacteriologic pathologic and experimental observations made by Dr. Ohara. The second part presents our own observations, which were made at Washington, D. C., on material furnished at our request by Dr. Ohara and which have led us to the conclusion that Ohara's disease and tularemia2are identical. CHARACTERISTICS OF OHARA'S DISEASE Distribution. —Dr. Ohara's attention has recently been called to an acute febrile disease transmitted to man by the wild rabbits of the Abukuma Mountains in the eastern part of Fukushima Ken (prefecture), Japan. In January, 1924, a mother and two sons, simultaneously stricken with the same disease, sought