Experiments came in to support the studies in etiology; two of those may be quoted.

Mosquitoes which had bitten malarial patients in Italy were sent to London and there allowed to bite Mr.Manson, son of Dr.Manson.This gentleman had not lived out of England, where there is now no acute malaria.

He had been a perfectly healthy, strong man.

In a few days following the bites of the infected mosquitoes, he had a typical attack of malarial fever.
(3) Journal Linnaean Society, London, 1879, XIV, 304-311.
(4) Medical News, Philadelphia, 1889, LV, 689-693, and monograph with Kilborne, Washington, 1893.
The other experiment, though of a different character, is quite as convincing.

In certain regions about Rome, in the Campania, malaria is so prevalent that, in the autumn, almost everyone in the district is attacked, particularly if he is a newcomer.