EMERGENCE PROM HIBERNATION, 1907. 



75 



Tabli XXXVII. ( 'kronological arraruh nu nt oj sectional records showing relative 

 rival at Pal/as, Calvert , and Victoria^ Tex., 1906 1 Continued. 



VICTORIA. 



When 

 started. 



1906. 



Oct. 25 



Do 



Nov. 6 

 Nov. in 



Nov. II 



Nov. 21 



Do. ... 



Nov. 28 

 Nov. 29 



Sec- 

 tion 

 Dum- 

 ber. 



Charai ter of shelter and food. 



Date of 



I | I 



emer- 



Weeds and mass 5 inches; stalks left. 

 Weeds ami grass 5 Inches; stalks 



removed. . . 

 Weeds and grass i ■'> Inches; .si ilks 



»ail. left 



Moss, bark, chi] s. etc.; no food 

 Grass and weeds 5 Inches; sialks 



removed 



Slalks pulled, left; .ura^s and weeds 



.". Inches 



crass and weeds in Inches; stalks 



pulled and lefl 



Weeds and u'rass 2 Inches; sialks 



pulled and lefl 



Ground bare; no food 



Bollsa 



Total and average. 



Ian:. 



Ma\ II 



Maj l; ' 



May 11 



June i"> 



Ma\ 6 



Apr. 28 



May 23 



..do... 

 May 11 



Mar. I 



muni er 



wee°vlls. '■" I "' ed " 



Total 

 weevils 



2,850 



2,850 



2,850 



2,850 



2,850 

 1,088 



22,463 



-.'Ml 



in.", 



I.;l 

 674 



362 



149 



374 



588 



i.i'.i 

 2 





Pen 1 ■ 1 1 1 - 



sun i\ al. 



s. I'. 



I I ' 

 5.61 



lL». 70 



L5.88 

 13. I'.t 



20.63 



1 2. 78 



Rank "f 

 section in 



sun i\ al 



13. 17 



a Three bushels of bolls on (he surface, and :i bushels covered w iih _' indies of earth. 



The results of this work arc exceptionally striking- in the case of the 

 Dallas record. The Calvert record ranges between that of Dallas and 

 Victoria in regard to the clearness with which comparative effects are 

 shown. In each ease there is, however, a general tendency toward 

 more successful hibernation as the season advances after the middle of 

 October until the time when frosts occur. In the case of the Dallas 

 records there occurred an almost uninterrupted increase in percentage 

 of survival with each date upon which experiments were started. 

 The apparent exceptions are readily explainable by other facts than 

 the time of starting the experiment. Section 12, which ranged sixth, 

 received weevils collected at Brownsville, Tex., which made it neces- 

 sary to ship for a long distance. During this shipment their food 

 supply became poor, and the weevils were undoubtedly much weaker 

 upon being placed in the cage than were those which had been col- 

 lected in the immediate vicinity of Dallas. Section 6 was not provided 

 witli any shelter for the weevils, and the percentage of survival was 

 smaller on that account than in other sections started at about the 

 same date. Section 10, which ranged ninth, received only infested 

 bolls, upon and within which weevils were hibernating. From 

 October 13 to November 15, under approximately similar conditions, 

 the percentage of survival increased from 2.(51 to .31.34. (See PL 

 VII, figs. 2, 3.) A more forceful argument than this for the destruc- 

 tion of the food .supply as early in the fall as is possible could hardly 

 be given. 



A combination of the records for those localities at which experi- 

 ments were started upon the same or approximate dates, grouping 

 them so that the chronological sequence is most clearly shown, adds 

 additional emphasis to the statements which have just been made. 



