66 



the current year. The work was done so long ago it had become as a 

 closed book to me, and it required considerable effort to take up the 

 old thread and recollect just what I had in mind when the bulletin was 

 published. 



Mr. Cordley says that I worked out the length of time required in 

 the different stages of the life history of the first brood and then 

 claimed four broods for the Willamette Valley in Oregon upon the 

 mathematical calculation as to the time required. His criticism is a 

 just one, for that is exactly what I did do, the very nature of the case 

 making it impossible to observe the sequence of broods with anything 

 like exactness. He might have gone further in his criticism, for in 

 the bulletin referred to, after making with some emphasis the state- 

 ment that the moth is four-brooded, I inserted the accompanying table 

 as proof of this, which table really disproves rather than proves it: 



Moths emerge from cocoons 



Egg laying < when moths are about 10 days old) . . 



Hatching of eggs (5 to 10 days | 



Life of larv;v in apple i i weeks) 



End of larval and pupal stages in cocoon (3 weeks), 

 and emergence of moths. 



A. 



B. 



c. 



D. 



June 1 June 20 



Aug. 9 Aug. 28 



June 11 June 30 



Aug. 19 sept. 7 



June 21 



Julv 10 



Aug. 29 Sept. 17 



Julv 19 



Aug. 7 



Sept. 26 



Oct. 15 



Aug. 9 



Aug. 28 



Oct. 17 



Nov. 5 

 or fol- 

 lowing 

 spring. 



Oct. 17 

 Oct, 27 

 Nov. 6 

 Dec. 4 

 Emerged 

 the fol- 

 lowing 

 spring. 



Mr. Cordley in his critical discussion goes on to say that he has 

 never been able to get a moth to mature as late as October 15. In 

 fact, he writes to Mr. Gillette that he has never been able to rear a 

 moth later than September 15. One at once draws the inference that 

 October 15 or before, in his estimation, marks the last appearance of 

 the imago, and Mr. Gillette, referring to Mr. Cordley's statement 

 that he has never been able to rear a moth later than September 15, 

 cites it as proof that the larvae of the codling moth begin to hibernate 

 in Oregon as early as the first week in August, which fact he says 

 almost certainly cuts the number of broods to two. Mr. Cordle} T 

 further says that in column "D" of my table there is an implied infer- 

 ence that at least a partial brood of moths would appear November 5. 

 A glance at the table will show that that matter is left in doubt. I 

 note, too, that Mr. Cordley says my statement regarding a third or 

 fourth brood at Corvallis is without any foundation of fact. What 

 answer would he make then to the fact that I found a moth out of 

 doors as late as November 15? This moth must have originated in an 

 egg laid somewhere between September 15 and -September 25, which 

 I believe, though I may be wrong in my assumption, either points to 

 a third brood or to such extreme irregularity in the life history of the 

 moth In western Oregon as to preclude a successful stud} 7 - of the 

 number of broods. 





