76 



HIBEENATION" OF THE COTTON BOLL WEEVIL. 



Table XXXVIII. — Comparison of sectional records grouped by approximate initial 



dates. 



o Brownsville, Tex., weevils. 



b Average omitting Brownsville weevils, 16.91 per cent. 



c Absolutely bare ground. 



d Average without Dallas cage, 22.7 per cent. 



In this table 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 14 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 



