413 



MR. C. O^NETLL^S EXPERIMENTS AND 



a 



Successive breakings of Edisto Sea Island cotton. 



a b 



broke with 48*5 grs. lost 

 68-1 „ 297 



73'9 " 287 

 787 

 iio"9 



132-4 

 144-0 



ist break i"4 long 



2nd 



3rd 



4th 



5th 



6tli 



7th 



lO 



075 



o'55 

 0-45 



0'2 5 



o"i4 



b 



13 

 II 



0-9 

 07 

 0-35 



0'20 



365 



34" I 

 36-9 

 48-0 



8th „ ... ,. o-i „ ... „ 65-3 



The fibre a shows a regular increase of strength ; but b is 

 quite exceptional^ both as to actual and relative strength 

 of its parts : it is nearly of the same strength throughout, 

 and, examined by the micros cope, was found to be one of 

 those flat and twisted riband fibres which, though very 

 rare in good cotton, have been, curiously enough, taken by 

 microscopic delineators as the type of cotton hairs. I have 

 put it down because it shows that, even in the case of hairs 

 very deficient in secondary deposit, the strength increases 

 towards a certain medium point in the hair. 



I give here tabulated results of successive breakings of 

 four hairs of Uplands cotton ; and I draw attention to the 

 fact that the hairs c and d show some contradictory re- 

 sults, requiring at the early breaks a greater weight than 

 at some succeeding breaks, showing probably that the fibre 

 has been injured by the strain of the first break. This is 

 not, however, the general result ; for in a great number of 

 experiments the hairs show a greater resistance the second 

 than the first time, and so on till the last. 



Successive breakings of four hairs of Uplands cotton. 

 c d 



No. of break. Length. Grs. weight. No. of break. Length. Grs. weight. 



I 



IIO 



307 



2 



0-9 



27-8 



3 



0-57 



518 



4 



o'33 



76-3 



5 



0'25 



68-6 



6 



0'20 



109-9 



I 



0-8 



74"4 



2 



0-55 



136-3 



3 



0-45 



112-8 



4 



■0-275 



127*2 



5 



0-15 



II2-8 



