99 
of corn, March 2 and May 5, and two lots of cotton, April 29 and 
Jal}^ 20. With this arrangement the corn could be cut when it was 
no longer needed and the entire space given up to cotton later in the 
season. The screen prevented the escape of any moths or larv«, but 
left them subjected to very nearly normal weather conditions. It also 
served to keep out predaceous enemies and many of the larger para- 
sites, thus providing against possible depletion from these sources, 
and at the same time preventing accesa to the plants by moths outside 
of the cage. 
The cage was stocked with a large number of eggs on May 9, and 
the forthcoming generation of bollworms was traced in its develop- 
ment. The following table, compiled from dail}^ records, summarizes 
veiy briefly the average growth of each generation: 
Table XL. — Generations of bollworms, Paris, Tex., 1904. 
[Dates are for Paris, Tex., latitude about 33° 45'.] 
Brood. 
Moths 
out. 
Eggs de- 
posited. 
Larvae 
hatched. 
Larvae 
one- 
fourth 
grown. 
Larvae 
one-half 
grown. 
Larvae 
three- 
fourths 
grown. 
Larvae 
full 
grown. 
Pupae. 
1 (50 days) - 
2 (35 days). 
3 (31 days). 
4 (48 days). 
5 
May 6 
June 25 
Aug. 3 
Sept. 3 
Oct. 22 
May 9 
June 27 
Aug. 5 
Sept. 10 
May 14 
June 30 
Aug. 7 
Sept. 13 
May 21 
July 7 
Aug. 10 
Sept. 18 
May 26 
July 11 
Aug. 14 
Sept. 23 
June 1 
July 14 
Aug. 17 
Sept. 25 
June 5 
July 16 
Aug. 20 
Sept. 27 
June 8. 
Julv 18. 
Aug. 22. 
Oct. 2; in hiberna- 
tion. 
The first record of injury to cotton was on July 6, due to young 
larvae of the second brood. The damage rapidly increased until, on 
July 12, some sixty squares and a few yoang bolls had been destroj^ed. 
A few da3^s later, after the larvae from corn had pupated, the corn was 
removed and late cotton planted in its place. The injury of the two 
following generations was confined entirely to the early planted cotton, 
as the late cotton was not squaring in time to be subject to attack. 
The fourth brood was represented by but few individuals, due possibly 
to the fact that the greater number of the pupae from the third genera- 
tion had remained in the soil to hibernate. This conclusion was 
strengthened by the appearance of a moth on September 22, evidently 
a belated specimen of the generation due to emerge on September 3. 
The few larvae pupating early in October also passed into hibernation 
with the pupae of the previous generation still in the soil. 
LABORATORY EXPERIMENTS. 
In working out the life cycle of the bollworm in the laboratory at 
ditferent times during the summer it was found by Mr. Girault that 
the growth and transformations undergone by individuals indoors 
closely coincided with the data obtained from the field work. The two 
sets of experiments were run along together, and the agreement 
