49 



like the one shown in figure 3, A. In others the egg laying gradually 

 rises to a maximum and then declines, as shown by B, of the same 

 figure. 



DEPOSITION OF INFERTILE EGGS. 



All of the data given above are records of deposition of fertilized 

 eggs. In the case of one female which had not mated and was hence 

 laying infertile eggs, 1,723 were deposited, showing that the growth 

 of eggs in the ovaries must apparently go on without any reference 

 to fertilization. 



EGGS REMAINING IN THE OVARIES AT DEATH. 



In nearly all female moths at death there are in the egg tubules of 

 the ovaries a number of fully formed eggs. This number varies from 

 a ver3^few'to over 300 in different individuals. About 70 maybe 



375- 

 350- 

 325- 

 300- 

 275- 

 250- 

 225- 

 200- 

 175- 

 150- 



locr 

























- 375 







1 



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- 350 







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- ^9') 







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\ 

















- 300 







/ 



\ 

















- 97S 







/ 



\ 

















- 250 







/ 





\ 















99 S 







/ 





\ 



v 













200 







y 



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y 



\ 

 \ 





\ 







\ 







- 150 





/ 



I 



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inn 





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s. 



inn 



75 



A 



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- 75 



- 50 



- 25 



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50 - 



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t 

























E66S - 



12 3. 



5 6?? 



i 9 10 II 12 



EGGS 





DAYS ■ 



Fig. 



-Diagram showing, A, regular and, B, irregular oviposition curves (original). 



considered a fair average. Besides, there are in the ovaries a number 

 of much smaller eggs, in which the 3^olk has not yet been formed. 

 These ^'potential" eggs are much more numerous in females which 

 have laid comparatively^ few eggs during life, and fewer in others 

 which have deposited the full number, varying thus from 2,000 to only 

 50 or less. 



EFFECT OF FERTILIZATION ON EGG LAYING. 



Some interesting facts bearing on this matter were observed by Mr. 

 Girault in the laboratory. Several females which had been deposit- 

 ing infertile eggs were allowed to mate with males, and an accelera- 



