2 



The figures thus obtained have been used to deduce the following 

 data : 



Percentage of lint. 



Percentage of sound and attacked seeds by number and by weight. 



Average number of seeds per boll. 



Average weight of a single sound seed. 



Finally, sound seeds from affected and sound bolls have been 

 tested for germination. 



Although in every case a certain number of the seeds in the sound 

 bolls have been found to be damaged, the number of these in such 

 bolls has rarely exceeded ten per cent ; being usually much lower. 

 The figures given for damaged seeds in the " sound" bolls show how 

 very widespread Gelechia has already become. 



It appears from a study of the table that the following main con- 

 clusions can be drawn as to the nature of the damage : 



(1) The percentage of lint is reduced in the attacked bolls. This 

 result was somewhat unexpected; it was anticipated that the per- 

 centage would rise, owing to the reduction in weight of the damaged 

 seeds. As there is very little doubt that the lint remaining is of 

 poorer quality, this makes the total damage to lint still more serious. 



(2) There is almost invariably a very considerable reduction 

 in the number of seeds which develop from an attacked boll compared 

 with the number maturing from a sound one. In counting, all recog- 

 nisable seeds have been enumerated, whether sound, injured, or imma- 

 ture. The reduction in the number of seeds is perhaps due to some 

 of the seeds when yet very small having been entirely consumed by 

 the worm. If this be the case, the average number of seeds in 

 diseased as compared with sound bolls might depend to some extent 

 on the stage the boll had reached before being attacked. 



(3) In addition to the reduction in number of seeds per boll there 

 is also a reduction in weight of the sound seeds individually. This 

 reduction is as much as twenty-six per cent in the average of all the 

 seeds in extreme cases. 



