34 Farmers’ Bulletin 1275. 
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Fig. 28.—Section of jute sack having four strands to the inch. Such sacks are of no 
value in preventing spread of infestations from sack to sack in warehouses. The 
adult weevils can leave or enter such sacks at will. 
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ig. 29.—A heavy cotton close-woven sack with 24 strands to the inch. Sacks made of 
this material are on the market and have proved their effectiveness not only in pre- 
venting weevils from leaving the sacks but also in protecting uninfested seeds from 
infestation from without. 
