*Reprinted from the United States Naval Medical Bulletin, Vol. 6, No. 2, April, 1912, by permission of the Navy Department and of the author.
Losses in personnel, incident to war, fall naturally into various broad but well-defined groups, and these again may be subdivided and classified according to the particular purpose in view. Thus in reports and statistics distinction is commonly made between losses by sickness and casualties in battle, and the latter may be included under such subheads as "Killed," "Wounded," "Drowned," etc.