OVIPOSITION IN PIGEONS 305 
CONCLUSION 
These facts make it certain that the male dove can stimulate the 
female to lay, without copulating with her. 
Harper (’04) mentioned the fact that ovulation in the pigeon 
does not take place until after the bird is mated, but he was in 
doubt as to how far the influence of mating was a‘mental’ one and 
how far it was a matter of the introduction of sperm. The present 
paper goes to show that the stimulus to the whole process of egg 
development and laying is a psychic (neural) stimulus, not de- 
pendent upon the introduction of sperm. 
BIBLIOGRAPHY 
Craic, Wattace 1908 The voices of pigeons regarded as a means of social con- 
trol. Am. Jour. Sociol., vol. 14, pp. 86-100. 
Harrer, EUGENE Howarp 1904 The fertilization and early development of the 
pigeon’s egg. Am. Jour. Anat., vol. 3, pp. 349-386. 
