101 



Table XXVI — Effects of floating and submergence on all stages. 



Conditions of test. L^S. 



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 



e 



6 

 31 



6 



25 



.. 112 



3 



15 



25 



48 



None. 



lpupa. 





 

 1 





 2 



9 

 14 



Days. 

 4 to 8 



None. 



7 to 8 

 None. 



45 



3 

 2 



1 

 6 



2 



o 



3 











5 squares contained dead larvae; 



3 pupae destroyed by ants, and 7 



uninfested. 

 Squares but slightly wet inside. 6 



larvae and 5 pupae all alive and 



normal. 

 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 



6 recovered so as to feed, but 4 died 



Five adults submerged 



Do. 



in from 2 to 7 days; 1 lived 36 days 

 and laid 58 eggs. 



Ten adults submerged 



Fourteen adults submerged 



eggs in 15 weevil-days. 

 1 lived through test, but never fed. 



In the case of squares floating normally it is evident that they 

 might remain in water for several days without injury to the weevil 

 within. Very slight wetting of the cell takes place even under the 

 extreme conditions of submergence. The effect of a brief flood would 

 not, therefore, be at all injurious. As adults float as readily as do 

 squares, they may also be carried long distances, and, furthermore, they 

 are able to crawl out of the water onto any bushes, weeds, or rubbish 

 which they may touch. Even when floating for several days continu- 

 ously 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 aloug 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 Valle} T in Louisiana. 



PROBABILITIES AS TO THE INFLUENCE OF CLIMATE ON THE WEEVIL 

 IN COTTON REGIONS NOT NOW INFESTED. 



The influence which the lower temperature prevailing over the 

 northern edge of the cotton belt may have upon the development, 

 destructiveness, and spread of the weevil is as yet largely problemat- 

 ical. No considerable amount of accurate data upon the development 

 of the weevil being at present available except that collected at Vic- 

 toria, Tex., during the seasons of 1902 and 1903, it is impossible to 

 predict with certaintj^ how far or how rapidly the weevil may spread 

 or the rapidity of development which may take place under the differ- 

 ent climatic conditions prevailing in regions not at present infested, 

 or whether it may be expected that its destructiveness to cotton will 

 be materially reduced in other sections. These questions are, how- 

 ever, of considerable interest because of the probabilit}^ that the 



