206 



POULTRY PRODUCTION 



table was made by Eyeleshymer' from observations made 

 by placing thermometers in nests, so that they would come 

 in contact with tlie body of the setting hens. The Roman 

 numerals designate the hens, while the arable numerals 

 Indicate the days of incubation. 



Table XXVIII. 

 2 i 3 



I 



II 

 III 



IV 



I 



II 

 III 



IV 



16 



10 



17 



18 



20 



105.5 

 104.2 

 103.6 

 105.0 



Eycleshymer^ also made observations of eggs in relation 

 to the temperature of the setting hen. The temperature 

 of the hen was secured as before, and that of the eggs by 

 breaking the shell immediately over the embryo and inserting 

 the l)ull) of the thermometer. The results are tabulated in 

 Table XXIX. It will be noted that the temperature of the 

 egg is influenced throughout by the temperature of the fowl, 

 and that while there is an average difference of o\'er 3° the 

 first four days of the incubation period, there is an average 

 difference of li'j" the last four days of the period. This 



Biological Bulletin. May, 1907. 



Ibid. 



