76 



1 11 HKJi NATION OF THE COTTON BOLL WEEVIL. 



Table XXXVIII. Comparison of sectional records grouped by approximate initial 



Date. 



Locality. 



number. 



Basis 

 Dumber 



of 



weevils. 



Total 



number 



emerged. 



Percent- Rankto 

 age of P^nt. 



survival. 



survival. 



1906. 

 Oct. L3 



Dallas 1 



l 

 i 



3,800 

 2,375 

 2,090 



99 

 75 

 85 



2. 1 • I 1 



Do 



Calvert.... 



X 15 \\ 8 





Dallas 



4.07 1 

















259 



,J 





Calvert.... 





Ocl 19 



4 

 2 



2,375 

 3,610 



226 



) 88 



Ocl 20 



Dal!:. 

















5,985 



342 



5.71 





Dallas 





• 



7 



7 

 1 

 4 



3,325 



2, 375 

 2,375 



231 

 105 

 201 

 105 



6.95 ! 



del 25 



i 



1. )_' | , 



Do 





B.46 I ° 



Do 



do. . . 



1. 42 1 















10,450 



642 



6. 15 













Oct 2S 



2 



8 

 8 



2,3S9 

 2,850 

 2,375 



134 



2.50 



(13 



5. 61 





Oct 30 



Dallas... 



V v, I C 



Oct 31 



Calvert 

















7,614 



447 



5.87 





Dallas. . . 





Nov 5 



5 

 5 



7 



3,135 

 2,375 

 2,850 



383 



45 



674 



12.22 



Do 



Calvert 



1.89 \ 4 



Nov 6 



















8,360 



1,102 



13. IS 







Victoria 



Dallas 







Nov. 10 

 Nov 12 



8 

 3 

 9 

 9 

 5 

 11 



2,850 

 3,040 

 2,375 

 3,040 

 2,850 

 2,505 



362 

 448 

 438 

 788 

 449 

 804 



12.70 

 14. 74 

 18.44 

 25.92 

 15.86 

 31.34 





Nov 14 





2 



Nov 13 



Dallas 



Nov 14 







Nov 15 



Dallas 

















16, 720 



3,289 



19.67 





Dallas 





Nov 21 



12 

 9 

 3 



1,570 

 2,836 

 2,850 



65 

 374 

 588 



a 4. 14 



Do 





13.19 \ 3 



Do 



do 



20.63 1 















7, 256 



1.027 



''14.15 





( 'al vert 





Nov. 25 



ti 

 2 



(i 

 6 



1,425 



1 . 358 



975 



1,088 



359 



380 



46 



139 



25.19 



Nov. 26 

 Nov 28 



do 



Dallas 



27.98 j 



c4.72 [ k 



Do 





i 12.78 1 















4,N4(i 



924 



d 19. 07 



I 









a Brownsville, Tex., weevils. 



6 \\ erage omitting Brownsville weevils, 16. HI per cent. 



<■ Absolutely bare ground. 



d Average without Dallas cage, 22.7 per cent. 



In this tabic it may be seen that, taking all localities together, 

 whenever experiments were started upon approximately the same 

 date there is a most striking increase in successful survival at inter- 

 vals between the middle of October and the middle of November. 

 This table may be safely considered as representing in the most 

 general way possible the facts in regard to this point. An interval of 

 about eleven days between October 11 and 25 practically doubled the 

 percentage of weevils surviving. Again, in an interval of about ten 

 days between October 25 and November 5 the percentage was again 



