Insects and disease - mosquitoes and malaria.

The first reasoned argument in support of the belief of transmission of malaria by mosquitoes. King was an English-born American physician who witnessed the assassination of Abraham Lincoln in April, 1865, and as a bystander physician he was pressed into service during the assassination. He was also one of a few physicians who served in both the Confederate States Army and the United States Army during the American Civil War. Reproduced in part in Major, Classic descriptions of disease, 3rd ed., 1945, p. 104. Full text  of King's 1883 paper from Wikisource at this link.