40 
period. This objection is valid only to a certain extent as will be 
noted later. The remedy is certain to be effective if properly man- 
aged. Where Boll Worm ravages are very great the additional expense 
and application npon a minimum area of trap-planted peas becomes 
proportionately a matter of secondary consideration. The crop which 
can be most easily and successfully managed for this purpose is that 
of cowpeas planted in rows 6 or 8 feet apart as a trap bordering the 
cotton field. They should be planted late so as not to reach the height 
of their blooming period before the destructive August brood of moths 
appears. The area should be the minimum and will depend largely 
upon the size of the cotton field to be protected. The blooming pea 
vines attract the issuing moths for feeding purposes provided the cotton 
be early enough to have passed its attractive blooming period. It be- 
comes important, therefore, that the cotton be as early as possible. 
As will be seen from the experiments, the difficulty arises that even 
moderately weak solutions of the poisons scorch the pea vines if the 
weather be hot and sunshiny. This scorching at once brings to an ab- 
rupt end the utility of these plants as a trap crop. This result can be 
obviated by making the applications as weak as is advisable to insure 
death to the moths and then only applying it to portions of a row upon 
any one evening. This leaves unsprayed healthy portions for a series of 
evenings to follow. Applications should be made to only a portion of 
each row at any given time, since observation has shown that a moth 
once starting in a certain row, if undisturbed, is inclined to follow it 
up or down for some distance. The chances of poisoning are, there- 
fore, greater than were only certain of the rows sprayed and others 
not at all. In experiments 1 and 4 the same strength of the arsenical 
solutions was used. In the former the foliage was but slightly injured, 
in the latter, badly scorched. This is due to the arsenic for experiment 
1 having been placed in cold water for about six hours before using, 
while in experiment 4 it was in cold water for twenty-four hours pre- 
vious. Hence a greater per cent of arsenic had been dissolved in the 
latter. A poisoned mixture of arsenic prepared as in experiment 1 and 
applied while fresh in the proportion of 12 parts of the vinegar solution 
to 4 of the poisoned liquid will be efficient and yet not injure the vines. 
From experiment (> it will be noted that the corrosive sublimate mix 
tare of the same strength as those of experiments 1 and 4 was less im- 
mediate in its effects. If the dilutions were carried to the same extent 
as just advised for the arsenic it could doubtless be used with safety 
and good results. The experiment with a preparation of potassium 
cyanide, designated as No. 5, shows that the solution did no appreciable 
injury to the plants. Since it is a swift poison for insects, its use is 
undoubtedly effective. There could be no hesitation in concluding from 
the experiments that preference should be given to the cyanide prepa- 
ration and its use in. the proportion given in the trial recommended 
were it not for the fact that it was lately determined that there was a 
