A turkey brought to this laboratory for examination in 1934 was found to be harbouring protozoal parasites in the red blood cells, but the parasite was not definitely identified at the time. The parasite was determined as a Plasmodium species by Mr R. Daubney when he returned from leave; and when Dr Carlton Herman was a guest worker at thia Institute in 1939 Mr Daubney suggested that he might like to investigate the incidence of this particular parasite in turkeys in the neighbourhood of Kabete. A visit was then made to a nearby turkey farm, and blood smears taken from many poults. One of these birds proved to be infected with a Plasmodium. Using the blood of this bird, experimental infection was set up in other young turkeys.