106 



THE DEVELOPMENT OF RAW COTTON 



equal diameter should be proportional to their strength 

 as tested "by breaking strain. 



The author happened to possess two pure strains of 

 cotton whereof excellent samples were available, grown 

 under the most suitable conditions, which 

 W * lrfc ir k a d ko^h been graded by experts as extra- 

 Equivalent ordinarily strong. The diameter of a hun- 

 to its dred fibres from two such samples (strains 

 Strength. NQ ?? ^ NQ 31Q) showed relatively 



slight differences, but the breaking strain of one was half 

 that of the other, and the weight of equal lengths of fibre 

 was in the same proportion. Weight determinations were 

 made on a few samples from the series of Dated Flowers, 

 with similar results, but, since it was not possible to 

 construct a full series of data, it will suffice to illustrate 

 the main points by standard samples of different cottons. 



fibre weight 



The ratio x r-r . , where a: is a constant, is 



breaking strain 



almost the same in all cases thus : 



77 G. 

 310 G. 



3-26 

 2-60 



77 D.F. 

 310 N. 



2-87 

 2-95 



Assili 



3-10 



