Three cases of Paget's deforming osteomyelitis have been observed at the Stanford Clinic during the past few years. To these I have added one private case. Data in the possession of several of my San Francisco colleagues indicate that the disease is not so rare as is generally thought. REPORT OF CASES Case 1.—History. —A man, a hardwood finisher, aged 57, was admitted to the neurologic clinic, Dec. 18, 1912, with a complaint of noises in the ears and in the right side of the head. His mother died of cancer. He had been married thirty-three years, and his wife and four children were alive and well. The wife had miscarried four or five times. No history of syphilis was elicited, but alcohol and tobacco had been used excessively. The onset of the present condition was insidious, about seven years previously, with "wrecking of the system." The patient was