Ross proved that the mosquito was responsible for the transmission of malaria. On 20 August 1897, he found Laveran’s Plasmodium in the stomach of the Anopheles mosquito after it had fed on the blood of malaria patients. See also the earlier paper in the same journal, 1897, 1, 251-55.

In 1902 Ross was awarded the Nobel Prize in Physiology or Medicine "for his work on malaria, by which he has shown how it enters the organism and thereby has laid the foundation for successful research on this disease and methods of combating it."  See also 5251.

Ross provided the last link in the chain demonstrating the complete life-cycle of the parasite of bird malaria. He found that mosquitoes which had fed on malaria-infected birds, and which had allowed the parasites to develop and lodge in their salivary glands, could then infect healthy birds, which in turn became malarious. See also 5247.

Digital facsimile from the Internet Archive at this link.