140 



Table XXXVIII. — Efeds of floating and submergence on all stages. 



Conditions of test. 



Time 

 in test. 



Dead 

 at end 

 of test. 



Time 

 before 

 exami- 

 nation. 



Nor- 

 mal 

 adults 

 after 

 test. 



Remarks. 



Sixty squares floated in rain . 



Ten squares floated in rain.. 



Five squares submerged 



Do 



Hours. 

 6 



6 







31 



6 



25 



112 



3 

 15 



25 

 48 



None. 



1 pupa. 





 

 1 





 2 



14 



Bays. 

 4 to 8 



None. 



7 to 8 

 None. 



45 



3 



^ 



1 

 C 



2 



3 

 3 





 



5 squares contained dead larvae; 3 

 pupse destroyed by ants, and 7 unin- 

 fested. 



Squares but slightly v/et inside; 6 

 larvae and 5 pupae all alive and nor- 

 mal. 



1 pupa dead; 1 square uninfested. 



1 pupa and 2 larvae alive after test; 

 squares not wet much inside. 



One naked pupa submerged. 

 Ten adults floated 



Do 





Five adults submerged 



Do 



from 2 to 7 days; 1 lived 36 days and 

 laid 58 eggs. 



2 males died soon; females laid 43 eggs 



in 15 weevil days. 

 1 lived through test, but never fed. 



Ten adults submerged 



Fourteen adults submerged . 



In the case of squares floating normall}^ it is evident that they might 

 remain in water for several days without injury to the weevil within. 

 Ver}^ slight wetting of the cell takes place even under the extreme con- 

 ditions of submergence. The effect of a brief flood would not, there- 

 fore, be at all injurious. As adults float as readil}^ as do squares, they 

 may also be carried long distances, and, furthermore, they are able to 

 crawl out of the water onto an}^ bushes, weeds, or rubbish which they 

 touch. Even when floating for several days continuously they are 

 able to live and may be carried directly to new fields. The floating of 

 adults and infested squares explains the appearance of weevils in great 

 numbers along high- water line immediately after a flood, and indicates 

 that probably the most rapid advance the pest will make in the United 

 States will be into the fertile cotton lands of the Red River Valley in 

 Louisiana. 



PROBABILITIES AS TO THE INFLUENCE OF CLIMATE UPON THE WEEVIL 

 IN COTTON REGIONS NOT NOW INFESTED. 



The influence which the lower temperature prevailing over the 

 northern edge of the cotton belt, and other varied conditions prevailing 

 in special sections, may exert upon weevil development, destructive- 

 ness and spread is as yet largely problematical. A comparison of the 

 data obtained at Victoria in 1902 to 1904, with that obtained at points 

 in northern Texas and western Louisiana in 1904, throws light upon 

 some of these points. It has been demonstrated that under the influence 

 of the lower temperature prevailing at points like Terrell, Tex., there is 

 produced at least one less generation of the weevil than at Victoria. In 

 its migratory movement in the fall of 1904, the weevil covered a strip 

 of new territory about 60 miles in width. The weevil is now about 



