FERTILITY AND HATCHING OF EGGS. 159 



Buffon. 1772. ^ 



Histoire naturelle des oiseaux. 

 Paris. Vol. III. 



"Le coq," pp. 88-186. PI. II. Has much interesting 

 discussion regarding fertility, fecundity and incubation. 

 Many references to medieval and classical literature regard- 

 ing poultry. 



Curtice, C. 1903. 



Poultry Experiments. 



R. I. Expt. Rept. for 1902. pp. 333-373- 



Data on fertility and hatching of eggs in different sea- 

 sons of year. No very definite conclusions. 



Dryden, J. 1897. 



Poultry Experiments. 



Utah Agric. Expt. Stat. Bulletin 51, pp. 1-33. 



Gives some data regarding the influence of the following 

 factors on ''fertility:"' (a) season, (b) age of breeding 

 stock (females), (c) exercise, (d) length of time eggs have 

 been kept. No statement as to whether embryoes dying 

 early were distinguished from truly infertile eggs. Results 

 not conclusive. 



• 1907- 



Poultry Experiments. 



Utah Agric. Expt. Stat. Bulletin 102, pp. 203-237. 



Gives data on the efifect of housing on the fertility of 



eggs. 

 Fere, Ch. 1901. 



Reponses a quelques questions du questionnaire concernant 



les oeufs et I'incubation chez les oiseaux domestiques. 



Ornis, Vol. 11, pp. 425-426. 

 Gilbert,, A. G. 1901. 



Report of the Poultry Manager. 



Canada Expt. Farms Rept. 1900, pp. 251-277. 



Conclusion is reached, but not supported by numerical 



data, that winter laying and confinement adversely affect 



the hatching quality of eggs. 



