Lt.-Col. J. J. Woodward (1833-1884) was a Philadelphia surgeon who enlisted with the Army of the Potomac in June 1861. In May 1862 he was assigned to the office of the surgeon general in Washington where he planned hospital construction. His other claims to fame include performing autopsies on both Abraham Lincoln and John Wilkes Booth and attending to President Garfield after he was shot. Camp diseases include malaria, dysentery, pneumonia, jaundice, and other conditions less familiar to modern readers. "Crowd poisoning" appears to be any disease occasioned or aggravated by overcrowding, especially due to lack of ventilation. The "Scorbutic Taint" refers to scurvy, the cause of which was well understood by 1863 but the army had not solved the logistical problem of supplying soldiers with vegetables and fruits at remote posts. "Camp measles" may have been a fungal infection derived from musty straw. "Chickhominy fever," mentioned on p. 88, may have been malaria, typhoid or even dengue fever. It's a wonder anyone lived to be shot by the enemy.