4 BULLETIN" 288, U. S. DEPARTMENT OF AGRICULTURE. 



For several minutes only stained seed appeared . After the gin had been running 



5 minutes the sample taken showed 52 per cent of colored seed. At the end of the 

 first 10 minutes the sample showed 17.1 per cent of stained seed and after 15 minutes 

 7.4 per cent, while at the end of 20 minutes 2.8 per cent of stained seed appeared 





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Fig. 1, 



-.Sample of cotton seed taken 5 minutes after the'ginning of the second bale had begun, showing 52 

 per cent of red seed from the stained roll of the first bale. 



in the sample. The sample taken at the end of 25 minutes showed 0.5 per cent of 

 stained seed, and the one taken at the 30-minute period showed 0.1 per cent, or 1 

 seed in a sample of 801 seeds. 



When the bale was ginned, the roll was carefully examined and 32 stained seeds 

 were found. Not until 10 minutes after the second bale had been started did these 



FlO. •>.— Sample of cotton seed taken 10 minutes after !ho ginning of the second bale had begun, showing 

 17.1 per cent of red seed from the stained roll of the first bale. 



pass out of the gin. No stained seeds were found in the roll box alter the ginning 

 of the second bale. 



Those results indicate that the exchange of seeds in the roll takes 

 place very rapidly, practically the entire roll being replaced during 



