SEASONAL HISTORY. 



63 



egg stage averaged 1.9 clays at Alexandria, La., 2.61 days at Tallulali, 

 La., 3.73 days at Victoria, Tex., and 4.1 days at Dallas, these differ- 

 ences corresponding quite regularly to the differences in the humidity 

 of the various places. Table XXIII is presented to show the data 



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Fig. 7.— Diagram illustrating relationship of temperature to the egg period of the boll weevil at Victoria, 



Tex., in 1902. (Original.) 



which have been obtained on this stage, and is accompanied by two 

 diagrams (figs. 7 and 8) to illustrate the relationship between mean 

 temperature and the length of the egg period. 



Table XXIII. — Duration of the egg stage of the boll weevil. 



Place. 



Year. 



Eggs laid. 



Eggs hatched. 



Num- 

 ber of 

 eggs 

 laid. 



Total 

 num- 

 ber of 

 egg 

 days. 



Aver- 

 age 

 period. 



Mean 

 temper- 

 ature. 



Victoria, Tex 



1902 , 



1902 



1902 



1902 



1902 



1903 



1907 



1908 



1908 



1910 



Sept. 4-29 



Oct. 7-20 



Nov. 7.. 



Sept. 7-Oct. 3... 



Oct. 11-24 



Nov. 13 



384 

 95 

 12 

 17 

 19 

 25 



229 

 35 

 11 

 44 



1,434 

 430 



72 

 214 

 264 



93 

 436 

 145 



33 

 115 



Days. 

 3.73 

 4.52 

 6.0 

 12.59 

 13.9 

 3.75 

 1.9 

 4.1 

 3.0 

 2.61 



o F 



81.0 

 73.0 



Do 



Do 



Do... 



Nov. 24-28 



Dec. 2-9 



Dec. 5-15 



Dec. 15-18 



May 30- June 9. . . 



Sept. 2-7 



July 20-23 



Aug. 17 



62.0 



Do 



Do 



May 27-June 5 . . 

 Aug. 31-Sept. 5.. 

 July 17-20 



72.5 

 79.2 

 81.6 

 88.0 

 78.9 





Dallas, Tex 



Do 



Tallulah, La 



June27-Julyl0.. 



July 1-12 





Total 



871 



3,236 







Average 









3.7 



74 6 

















