THE BOLL WEEVIL PROBLEM. op 
means that the natural mortality among the weevils due to the effects 
of sunshine can be at least doubled. 
Although the chain cultivator was designed primarily for bringing 
the squares to the middles, it was found in field practice to have a 
most important cultural effect. The chains (so-called “ log chains”) 
are heavy enough to establish a perfect dust mulch (see figs. 7 and 8) 
and to destroy small weeds that may be starting. In fact, it is be- 
lieved that this 
cultural effect 
would more than 
justify the use of 
the machine, re- 
gardless of the 
weevil. With the 
effect against the 
insect and the im- 
portant cultural 
effect it is believed 
that this imple- 
ment or one simi- 
lar to it should be 
used by every 
farmer in the wee- 
vil territory. 
In order that 
the use of this 
machine could be 
obtained by all 
farmers at the 
smallest possible 
cost, a patent has 
been taken out in 
name of the De- gees 
pepumient of Ag- Fic. 8 Work of = Sait cultivator: Same row sane in 
riculture and for figure 7, after cultivator has passed; majority of squares 
the benefit of the brought to middle, crack filled, and dust mulch established, 
j (Author’s illustration.) 
; gen ee SPOT ee 
Vid ed tas a 1 
people of the 
United States. Under this patent it is impossible for anyone to 
manufacture the machine exclusively and to charge unnecessarily 
high prices. 
Attachments for ordinary cultivators—Some of the effects of the 
chain cultivator may be obtained by attaching chains to ordinary 
cultivators by the use of special attachments. In this way some of 
the effect of the chain drag will be added to the work of the cult1- 
vator. Wherever for any reason it is impossible to obtain chain 
512 
