AS EARLY as 1927 Doyle in England reported that the pigeon was susceptible to Newcastle disease. He suggested that the susceptibility of the pigeon to intramuscular injection be used as a character in distinguishing Newcastle disease virus from that of fowl plague. Susceptibility of pigeons to the virus introduced by intravenous or intramuscular routes has been repeatedly shown (Picard, 1928; Cooper, 1931; Kylasamaier, 1931; Acevedo, 1933; Dobson, 1934; Kuppyswamy, 1937; Crawford, 1930; Manninger, 1936; and Pomeroy, 1948). Age has been reported to be a factor in susceptibility to infection, young pigeons being more susceptible than older birds (Picard, 1928). However, relative susceptibility of various types of doves as well as pigeons has been only superficially studied. Kaschula (1950) infected the laughing dove Streptopelia senegalensis (Stigmatopelia senegalensis) by intramuscular route but was unable to infect the ring dove Streptopelia capicola. Contact infection or infection by feeding virus has been reported in .