ENVIRONMENT Otf, /pSjg .BOLL. 



truth of the belief that there is a necessary connection 

 between high out-turn and good lint; probably it is a 

 matter of accident that the circumstances which produce 

 high out-turn do also produce good lint under field con- 

 ditions. 



Having turned the out-turn data into lint weight (per 

 seed), we may now compare lint weight and seed weight. 

 They are evidently closely related, and the same cause 

 which affects one also affects the other. That the 

 relation is not absolute is shown without the necessity 

 of plotting correlation diagrams by the mere existence 

 of out-turn variations. The question therefore arises as 

 to the causes which may disturb this relation, causing a 

 seed to produce more or less weight of lint than is normal 

 for its own weight. 



We cannot ascribe a rise in out-turn to increased weight 

 of individual hairs through extra thickening, for if this 



were so the out-turn curve should be the 

 Possible 



Causes of same as the strength curve. We cannot 

 Out-turn ascribe it to increased length of hairs of 

 Fluctuations. thicknegSj for this would ma k e out . 



turn and length curves identical. If we ascribe it to 

 deficient nutrition of the seed during the later stages we 

 shall spoil our own argument, for that would entail de- 

 ficient nutrition of the lint hairs, which would thicken 

 less, and therefore weigh less. All these hypotheses and 

 many more can be tested on the data given here, and can 

 be found wanting ; there is only one which appears to fit 

 the case. 



This last hypothesis is rather remarkable, in that it 



