A. PEZARD 



279 



sufficient for determining its constants, we must be able to calculate 

 the other points of the curve beyond those derived from our experi- 

 mental data. The calculation made on the basis of the measurements 

 on Cock 6 (which died before regression was complete) leads us to 

 conclude that such is the case. 



s 



a 



•1— t 



I 



o 

 o 





90 



85 



80 



75 



70 



65 



60 



55 



1900 



1.850 



1,800 



1.750 



1700 



"Off 



o 



CO 



0123456789 

 Time in weeks 



Fig. 7. 



Experiment 6. — Cock, Beauceronne, about 6 months old. Secondary sex char- 

 acters in course of development. Comb and barbules scarlet. Sex insticts pres- 

 ent; crowing. Completely castrated Jan. 18, 1912; died Feb. 18 in a state of 

 cachexia (Fig. 8). 



Having made five measurements, we know five points of the curve; 

 three are sufficient for the calculation of /, C, 6. Utilizing these, 

 which correspond to 0, 1, and 4 weeks, we find: 



