THE BOLL WOBM REMEDIES. 
379 
natingchrysalids. Professor French lias experimented upon this point, 
and we quote bis results from the Prairie Farmer for October 2G, 1878 : 
To see what effect freezing would have upouthe chrysalids under different circum- 
stances I obtained quite a number the fore part of last December and treated them 
as follows, numbering the different lots for convenience: No. 1 I put in loose dirt, 
moistened a little and allowed to freeze; No. 2 were put in loose dirt .of * he same 
character, kept slightly moist, but W&te not allowed to freeze ; Xo. 3 were placed in 
segments of the smooth cells or holes from which tlicy bad been taken, the dirt of the 
cells kept as moist as v/hen taken from the field, but DO loose dirt allowed to get into 
the cells round the chyrsa.lids, and they were allowed to freeze ; No. 4, were treated in 
the same way, but wero not allowed to freeze : No. ;">, were cared for in a room of 
about the same temperature all winter and in a way best adapted to keep them from 
moulding. 
After a few hard freezes, and the teuipt i ;i t ui e had become milder, an examination 
of lots 1 and 3, that had been allowed t<> freeze, showed that all of lot one were dead, but 
none of lot 3. Lots 2, 3, 4 and 5 were then placed side by side and cared for alike 
the rest of the winter, so far as moisture mid temperature were concerned, but after a 
while those of lot 'J were taken out of the dirt and cared for the same as lot f>. These 
began hatching May 27, of last spring, and continued to come out till July 2D, and 
I could not sec as any greater percent, of lot .">, that had been well cared for all the 
time, hatched, than 2 or 3. 
From the effect of freezing upon those that had been mixed with moist earth, the 
conclusion was inevitable that fall plowing followed by fall rains and winter freezing 
would produce the same result, for tin plowing must break up their smooth cells and 
allow them to become surrounded by the loose soil whic h when wet sticks to them. 
If frozen in this condition they are evidently easily killed, but so long as their cells 
remain entire no amount of freezing under ordinary circumstances seems to injure 
them. 
This evidence seems very satisfactory, and in the northern part of the 
cotton belt at least, as well as in the great corn-growing regions of the 
West, fall plowing will undoubtedly prove an excellent remedy. In the 
major part of the cotton belt, however, something else is needed. 
Destruction of the moths.— L ighU and poisoned Sweets. — These 
remedies have been fully discussed under the head of Aletia, and the 
reasons t\ r their apparent want of success given. Testimony is not 
wanting as to their efhcaey with Heliothis. Mr. Schwarz, in one of his 
letters from Texas, describes a simple trap-lantern used by planters in 
the vicinity of Ilearne, Tex., the use of which "proved most effectual 
against the ravages of the Boll Worm, which in 1877 did more harm here 
than Aletia, and which was killed in great numbers by this method." 
Experiments made by Mr. Sehwarz during the summer of 1879 at Colum- 
bus, Tex., where twenty lamps were watched and the captures tabulated, 
showed that, although not so abundant, the moths of IJeliothis were 
more readily attracted by the lamps than Aletia, and more were caught 
in this way. It must be remembered, however, in experiments of this 
kind, that a large proportion of the moths captured are males, or females 
which have already deposited their eggs. Mr. Crane, of Mandarin, Fla., 
who lost in 1878 a large proportion of his crop of tomatoes by Helio- 
this, in 1879 built fires of light wood in his field with much profit. 
