LABGE-CAGE EXPERIMENTS AT DALLAS, TEX., L905 6. 



49 



LARGE-CAGE EXPERIMENTS AT DALLAS, TEX., 1905 6. 



The work at Dallas for L905 6 was planned especially to check 

 the results of t he experiments al Keatchie w hich have been described. 



The cage used (PL IV, fig. l) was divided into four sections, each 

 having a ground area of I00 square feet. In one section the natural 

 conditions of shelter were left unchanged (PI. IV, fig, 2). There 

 was practically no grass upon the ground, bul the growth of stalks 

 was quite heavy. In the other three sections the shelter provided 

 (Pi. V, figs. 1 and 2) for the weevils was arranged in such ji way 

 that it might be possible to divide each section into two pails by a 

 middle partition. Unfortunately the first cold weather occurred 

 before the weevils could be placed in these sections, and it was acces- 

 sary to keep the weevils confined in boxes for several days until it 

 became sufficiently warm to render them active so that they might 

 find shelter in the cages. The weevils were Liberated at approxi- 

 mately the center of each section and allowed to move in any direc- 

 1 u n they might choose. The object of this was to determine whether 

 particularly favorable rubbish might exert a special attraction for 

 the weevils. 



About three w T eeks after the weevils were liberated an examina- 

 tion was made of each section and the number of weevils crawling 

 actively upon the wire was determined. An examination of the 

 boxes from which the weevils were liberated and which had been 

 left undisturbed in the cages during this period showed that a large 

 mortality had occurred before the weevils really entered hibernation. 

 Table XXVI shows the principal points in regard to the beginning 

 of the experiments and the emergence of the weevils during the 

 following spring. 



Table XXVI. — Large-cage experiments in hibernation at Dallas, Tex., 1905-6. 



1 ion 

 of cage. 



Kind of shelter. 



Weevils 



put in. 



Active 

 wcc\ Lis, 

 Decern- 



1 -r 26, 

 1905. 



Weevils 

 found 



dead, 



l lecem- 



ber26, 



L905. 



Percent- 

 age of 

 weevils 

 active, 

 Decem- 

 ber, L905. 



Perce nt- 

 age of 



living 



those ex- 

 amine. 1. 



Hate of 



first 

 emer- 

 gence, 



L906. 



Day of 

 largest 

 emer- 

 gence, 

 1906. 



I 



Cotton stalks 



Cotton .stalks i« 



moved M 

 22, L906. 

 Cotton stalks and 

 lea i 



2. i 



2,500 



200 



615 

 515 



14.4 



38.0 

 28.0 



\|ir. 1 

 Mar. 22 



Apr. 1 



Apr. 23 

 May It 



\pr. 1 

 Apr. 9 



May 2 

 Apr. 9 



Apr. 11 



Apr. 23 

 May 1 1 



Apr. 11 

 Apr. 'J 



11: 



l't. 1.. 



Pt. 2... 



Ill: 



Pt. 1.. 



2,500 1 260 1 .31.', 



10 I 



17.7 



Pt. 2.. 







Hay 



IV: 



Pt. 1.. 

 Pt. 2. 



Piled boxes 



Corn and cotton 



Iks. 



Total and 

 avei 



2,600 



L':;s i G25 



'.). :, 



12. 7 















10, 100 



1,073 





L0.6 



21 h 





90317— Bull. 77— 09 



