SPINNING TESTS OF UPLAND LONG-STAPLE COTTONS. 



17 



Table X. — Breaking strength in pounds per sJcein of carded yarns and of 

 combed yarns resulting from the 13 to 15 per cent comber settings. 



Variety. 



Staple. 



Carded 

 yarn. 



Combed 

 yarn. 



Difference. 



Pounds. 



Per cent. 





1* 

 1A 

 1* 

 1* 



1A 



24.03 

 25.56 

 34.93 

 25.88 

 26.13 

 32.98 



33.07 

 34.50 

 41.92 

 32.12 

 33.47 

 42.05 



8.94 

 8.94 

 6.99 

 6.24 

 7.34 

 9.07 



37.6 



Columbia 



34.9 





20 



Webber No. 1 



24.1 



Webber No. 2 



28.1 



Delta 



27.5 







The last column of this table shows that the combed yarn ranges 

 from 20 to 37.6 per cent stronger than the carded. The increased 

 breaking strength of the combed yarn is due to the fact that most 

 of the short fibers have been removed by the comber. It is safe to 

 assume that fabrics made of combed yarns possess better wearing 

 qualities than similar fabrics made of carded yarns. 



An analysis of Table X shows that there was but slight difference 

 in strength between the yarns made from Durango, Columbia, and 

 Webber. These varieties, whether spun from the carded or combed 

 cotton, appear to be closely comparable in this respect. The Lewis 

 and Delta varieties, however, here show a marked superiority over 

 the others, their breaking strength being from 25 to 33 per cent 

 greater in carded yarns and slightly more than 25 per cent greater 

 in combed yarns. The carded yarn from Lewis had a breaking 

 strength practically 2 pounds greater than that from Delta, while 

 the combed yarn from Delta was thirteen one-hundredths of a pound 

 stronger than that from Lewis. It is notable that the yarns made 

 from the Delta types, which are usually small-boiled cottons, were 

 stronger than those from the big-boiled types, and that the Lewis, 

 which seems to be an acclimated strain of Mississippi cotton brought 

 several years ago to the Piedmont section of North Carolina, is fully 

 equal in strength to the native Delta cottons. 



CULTURAL CHARACTERISTICS. 



The purpose of this publication is to show the comparative spin- 

 ning values of the varieties tested, but it must not be assumed that 

 their relative value to the farmer is the same as to the spinner. The 

 Columbia, Webber, and Durango have much larger bolls than the 

 LeAvis and are much more rapidly picked. In a number of test plots, 

 where single rows of 16 varieties of staple cotton have been grown for 

 comparison, the Lewis has been among the lowest in yield and in 

 gross value per acre when calculated at the same price, while Durango 

 and Columbia have stood high. The percentage of lint to seed in the 

 Lewis has been lower than in the Durango and Columbia. The de- 



