30 THE BOLL WEEVIL PROBLEM. 
ground the thermometer registered 140° F. on the surface. Likewise 
90° I. in the shelter was accompanied by 120° F. on the ground and 
85° IF. in the shelter by 110° F. on the ground. It is not. surprising, 
therefore, that the cotton squares that fall to the ground and are not 
shaded are very quickly baked, so that the weevils perish—if not 
from heat, then from the hardening of the food supply. In most 
cases they are simply roasted, their bodies assuming the appearance 
of larve that have been placed in a flame. 
Chain cultivator—When the foregoing facts came to light efforts 
were made to perfect a device that would bring the infested squares 
out of the shade of the plants to the middles of the rows. After 
much experimental work one of the writer’s former associates, Dr. 
W. E. Hinds, devised an implement that accomplishes the desired 
work in a satisfactory manner. This implement is known as the 
chain cultivator or chain drag. 
Fic. 6.—Chain cultivator, side view. (Author’s illustration.) 
The following specifications should enable any blacksmith to con- 
struct an effective chain cultivator. (See fig. 6.) 
The draft bar (m m), made of 4 by ;'; inch tire steel, about 52 
inches long, is designed to be about 16 inches above the ground, and 
this is the height of the rear arch (f A m), which is of this size and 
form to allow old cotton roots, etc., to pass through freely without 
clogging at the rear. 
The distance between the rear ends of the chains (g g, f f) is 
in each pair fixed at about 10 inches. The distance between a chain 
of one pair and that of the other at their front ends should be about 9 
inches. The chains used are of the size known as “log chains,” hav- 
ing short, close links of 2-inch iron. This style of chain can be cut to 
the length needed in each case. The chain is easily attached by sim- 
ply making the hooks at d, e, f, and g so that the end of the hook is 
as wide as will pass through the length of the link and narrow enough 
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