BULLETIN No. 90a. 
21 
It will be observed from the tables that the lower grades by the 
leaf-cure contained a much larger amount of sand than those by the 
stalk-cure. This is due to the fact that these lower grades are the 
leaves nearest the ground, and naturally collect sand by the action 
of rain upon the soil adjacent to the leaves. They were all pulled 
by the leaf process as they ripened, while in the stalk process many 
of the lower leaves, together with the sand contained on them, had 
fallen off*before the time for harvesting. This inequality in the per¬ 
centage of sand made it necessary to calculate the samples to a sand- 
free as well as water-free basis for a full comparison. (See tables 
V, VI and VII.) Table VII combines the two preceding tables, 
and presents, by calculation, the composition of the whole leaf, 
including midrib. 
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