CASE.—Private R. W. Wilder, Co. H, 7th New York Volunteers, was wounded at Fredericksburg, December 13th, 1862, by a conoidal musket ball which passed from behind forward through the mastoid process and the concha. He also received a wound in the right side of the abdomen, near the terminal costal cartilages. The patient was conveyed to the hospital of the 1st division, Second Corps, where cold water dressings were applied. On December 20th he was sent to Lincoln Hospital, Washington, and on January 17th, 1863, was transferred to the Howard Hospital. He recovered, except from the deafness of the right ear, and was returned to duty on April 11th, 1863.