30 



BULLETIN &18, U. S. DEPARTMENT OF AGRICULTURE. 



ings were made of the seed from each pick to determine the loss in 

 weight between the seed of the different picks (Table XV). 



Table XV. — Weight of even number of containers of cotton seed for each pick. 



Sample No. 



First 

 pick. 



Second 

 pick. 



Third 

 pick. 



Sample No. 



First 

 pick. 



Second 

 pick. 



Third 

 pick. 



1 



Kilos. 

 10.5 

 11.0 

 11.1 

 11.3 

 11.1 

 11.2 

 11.2 



Kilos. 

 10.5 

 10.7 

 10.6 

 11.0 

 10.9 

 10.8 

 10.9 



Kilos. 

 10.5 

 10.6 

 10.6 

 10.5 

 10.6 

 10.8 

 10.8 



8 



Kilos. 

 11.1 

 10.9 

 11.0 



Kilos. 

 10.7 

 10.9 

 10.5 



Kilos. 

 10.7 



2 



9 



10.5 



3 



10 



10.6 





Total 







110.4 

 11.04 

 6.24 



107.5 

 10.75 

 5.95 



106.2 



6... 



10.62 



7 



Net weight 



5.82 









Weight of container, 4.8 kilos: container used=20 liters. 



From Table XIV it is shown that there is 3.1 per cent loss in weight 

 in the seed from the first pick; therefore the weight of one 20-liter 

 measure (6.24 kilos) would be equal to only 96.9 per cent of the weight 

 of sound seed, and the corrected weight of a 20-liter measure of sound 

 seed should be 6.43 kilos. 



From these data it is shown that there is a loss of 0.19 kilo in the 

 seed of the first pick, 0.48 kilo in the second pick, and 0.61 kilo in 

 the third pick. These losses reduced to a percentage basis would 

 equal 2.9 per cent of the seed lost in the first pick, 7.4 per cent in the 

 second pick, and 9.4 per cent of the third. But as 40 per cent of the 

 crop was harvested in the first pick, 40 per cent in the second pick, 

 and 20 per cent in the third pick, these figures when given their 

 weighted values will equal 5.96 per cent of the total seed lost due to. 

 pink-bollworm attack. 



This difference of 0.94 per cent between the figures representing 



the total loss in the seed when hand-ginned and when commercially 



ginned is explained by the fact that part of the damaged seed is 



broken in cleaning and ginning the cotton, and passes out with the 



cleanings, trash, and even in the lint. It is thought, therefore, that 



the figure given for the hand-ginned sample, 6.9 per cent, represents 



more nearly the actual loss in the seed of the pickable cotton than does 



the figure 5.96 per cent obtained from the commercially ginned 



sample. 



Loss in Quantity and Quality of Oil. 



Besides the losses in the weight of the seed, there is also an addi- 

 tional loss in quantity and quality of the oil produced. 



Because of the danger of introducing the pink bollworm into the 

 United States, it was thought advisable not to bring seed out of 

 Mexico for analysis. Samples were taken from the different field 

 samples as ginned and given to the chemists of the largest oil mill in 

 the Laguna district. Owing to the unsettled conditions prevailing 

 in that section of Mexico during 1920, reports on these samples have 

 not been received. 



