CASE.—Private Frederick E——, Co. M, 4th Pennsylvania Cavalry, aged 38 years, was wounded near Petersburg, Virginia, November 25th, 1864, by a conoidal ball, which penetrated the right parietal bone near the superior border and emerged near junction of the occipital and parietal bones. He was admitted to the hospital of the 2d division, Cavalry Corps, on December 1st; on the 9th, sent to the Cavalry Corps Hospital, Army of the Potomac , and on the 15th, transferred to the Armory Square Hospital, Washington. On December 18th, he was placed under chloroform and his skull trephined by Surgeon D. W. Bliss, U. S. V. The edges of the wound were brought together with straps, and the patient rallied well from the operation. During the following day he complained of pain in the head and was slightly delirious. On the morning of the 20th, he ate a hearty breakfast, then fell into a profound stupor, from which he never recovered. Complete paralysis of the left arm and partial paralysis of the left leg supervened; hernia cerebri also appeared, and death occurred on December 20th, 1864. The pathological specimen is No. 3516, Sect, I, A. M. M., and consists of a disk of bone from the parietal one inch in diameter. The specimen and history were contributed by Surgeon D. W. Bliss, U. S. V.