37 



One of Professor Gillette's correspondents reports that he tound 53 

 larvaj under 295 bands in two weeks. Another reports 307 larvse 

 April 2 and 409 April 17 from 2,500 bands. Gillette thinks that the 

 number caught under these bands is too small to be of an}^ great 

 value as a remedial measure. 



DURATION OF THE STAGES IN THE COCOON. 



On account of the direct influence of this question upon the system 

 of banding, j^articular care was taken to ascertain the duration of the 

 cocoon staoe, and especiall}' the mininuim time. The older writers 

 gave estimates of this time with but little detinite data. Rile}^ gave 

 from 15 to 21 days; Washburn, 3 weeks; Slingerland, 2 to 3 weeks, 

 and Aldrich a])out 1 week. Professor Gillette gives records of com- 

 plete experiments upon this point. In 1900 observations made for 

 him upon lol larvaj gave a minimum of 12 da3's, a maximum of 29 

 da3^s, with an average of 20 daj's. Other experiments directed by the 

 same writer in 1001 on 7(5 larvae resulted in finding the minimum to be 

 3 days; maximum, 23 days, and average 16f daj^s. In 1900 the 

 writer found that in 7 cages the shortest time varied between 12 and 

 15 days, with an average minimum of about 11 days. In 1902 a large 

 series of breeding experiments were carried out, the results of which 

 are incorporated in the following table: 



Table IV. — Duration of life of the codling moth iu.mJe the cocoon. 



