SEASONAL HISTORY. 



63 



egg stage averaged 1.9 days at Alexandria, La., 2.61 days at Tallulah, 

 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 



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. 



Victoria, Tex... 



Do 



Do 



Do 



Do 



Do 



Alexandria, La. 

 Dallas, Tex 



Do 



Tallulah, La.... 



Total 



Average 



Year. 



1902 

 1902 

 1902 

 1902 

 1902 

 1903 

 1907 

 1908 

 1908 

 1910 



Eggs laid. 



Sept. 4-29 



Oct. 7-20 



Nov. 7 



Nov. 24-28 



Dec. 2-9 



May 27-June 5 . 

 Aug. 31-Sept. 5. 



July 17-20 



Aug. 14 



June27-July 10. 



Eggs hatched. 



Sept. 7-Oct. 3 . 



Oct. 11-24 



Nov. 13 



Dec. 5-15 



Dec. 15-18 



Mav30-June9. 



Sept. 2-7 



July 20-23 



Aug. 17 



July 1-12 



Num- 

 ber of 

 eggs 

 laid. 



3S4 

 95 

 12 

 17 

 19 

 25 



229 

 35 

 11 

 44 



Total 

 num- 

 ber of 

 egg 

 days. 



1,434 

 430 



72 

 214 

 264 



93 

 436 

 145 



33 

 115 



3,236 



Aver- 

 age 

 period. 



Days. 

 3.73 

 4.52 

 6.0 

 12.59 

 13.9 

 3.75 

 1.9 

 4.1 

 3.0 

 2.61 



3.7 



Mean 

 temper- 

 ature. 



F. 



81.0 



73.0 



62.0 



72.5 

 79.2 

 81.6 

 88.0 



