334 



kiddle: control of sex ratio 



male-producing egg of the spring is an egg that stores less ma- 

 terial than does the female-producing egg of the autumn. (2) 



TABLE 8 



Stored Energy or Eggs (1914) of Streptopelia risoria ( 9 558) as Determined 

 by the Bomb Calorimeter 



NO. 



DATE 



WT. OF YOLK 



ENERGY 



PER CENT DIFF. 



665 



Al 6- 6 



"1.010 



"3,358 





666 



A2 6- 8 



0.970 



3,175 



b - 5.8 



674 



Bl 6-19 



0.855 



2,807 





675 



B2 6-21 



1.000 



3,245 



+ 15.6 



699 



■ CI 7-14 



1 . 145 



3,815 ? 





700 



C2 7-16 



1.463 



5,008 



+31.3 ? 



728 



D 8-30 



1.395 



4,812 







E 9- 9 or 



10 soft shell, bro 



ken. 







Fl 10-17 



soft shell, bro 



ken 







F2 10-19 



soft shell, bro 



ken 





770 



Gl 11- 6 



1.440 



4,837 (?) . 



• 



771 



G2 11- 8 



1.720 



5,797 



+ 19.8 ? 



774 



HI 11-20 



1.590 + si. loss 



4,906 + 





775 



H2 11-22 



1.780 



6,015 



+22.6 ? 



776 



11 12- 1 



1.640 



5,614 





777 



12 12- 3 



1.820 



6,255 



+ 11.4 



781 



Jl 12-12 



1.535 



5,302 





782 



J2 12-14 



1.690 



5,601 



+ 5.6 



791 



Kl 12-23 



1.485 



5,266 (?) 





792 



K2 12-25 



1.718 



5,880 



+ 11.7 ? 



° This egg was not only the first laid during season, but first during life of 

 this bird. » 



b The percentage differences are based upon a value of 100 per cent for the 

 smaller egg of the pair. 



That the male-producing egg of the clutch stores less material 

 than does its female-producing mate. (3) That the eggs of old 



