6 BULLETIX 288, U. S. DEPARTMENT OF AGRICULTURE. 
showing iii round numbers about how much mixing may occur. 
Each roll contains from 35 to 40 pounds of seed, or slightly more 
than a bushel. The four rolls in a 4-gin battery therefore would 
contain frqni 140 to 160 pounds, or from 4 to 5 bushels of seed. 
If most of these passed out of the roll boxes during the gimihig 
of a bale of cotton, as is indicated by the results at hand, they would 
comprise from 14 to 16 per cent by weight of the total quantity 
(about 1,000 pounds) of seed usually obtained by the patron from 
the seed cotton necessary to make a bale of lint. 
TTbile such an admixture in itself is sufficient to justify a demand 
for more care than is ordinarily exercised at custom gins, it must 
be remembered that the roll box is not the only source of mixture 
at the gin. 
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Fig. 5.— Sample of cotton seed taken 25 minutes after the ginning of the second bale had begun, showing 
0.5 per cent of red seed from the stained roll of the first bale. 
OTHER SOURCES OF MIXTURE. 
It has already been pointed out that some mixing may occur before 
the seed cotton reaches the roll box, and also that further mixing 
occurs in the seed conveyor. While it is impossible to determine the 
amount of mixing which may occur in the flues, it may be measured 
in the seed conveyor by a continuation of the method employed hi 
making determinations in the roll box. 
Such determinations were not made at Greenville, but it was ob- 
served that even after the second bale was ginned red seeds were 
found scattered along the conveyor from the gin to the seed house. 
Thus, while the seed was badly mixed before it was delivered into the 
conveyor, it was mixed more and more thoroughly as it was stirred and 
crowded forward by the conveyor screw. For this reason it is appar- 
ent that the amount of mixture hi the seed delivered to the patron is 
even greater than is indicated by the determinations made at the gin. 
