47 
period, the temperature had been maintained as high as in the first, the 
worms would have matured more rapidly. This is verified by noticing 
the retardation of growth of the last worm recorded in the table. This 
worm had only molted twiceafter 18 days. Thetemperature during this 
period was 18° lower than that of the first two and 9° lower than that 
of the second two. General observations established this fact concern- 
ing the feeding of the worms, viz: that a moderate amount of rain 
with high temperature was least suited to their most vigorous feeding 
and growth, and consequently their earliest maturity. The same 
amount of rain, however, with a much lower temperature, is as much 
a disadvantage, and increases the retarding effect, which the lowertem- 
perature itself would have had. Butagain, high, dry temperatures are 
avoided by the worms, which during that time feed less vigorously, 
and thereby prolong their larval existence some. 
Light frosts began (both in Mississippi and Louisiana) as early as 
October 27, and were more or less continuous from that time on. At 
Holly Springs, Mississippi, a killing frost occurred October 31, which 
froze and entirely blackened the cotton plants. At Shreveport, Louisi- 
ana, however, the cotton was not entirely frozen and blackened until 
about December 4. As has been previously noted, worms of nearly all 
stages were found at both localities a short time previous to the killing 
frosts, by which latter the younger ones were quite certainly killed. 
Pupa.—For the first of the pup recorded it is found that a mod- 
erate amount of rain with high temperature shortens the duration of 
the pupal state. From the remaining ones it is found that with but 
little variation in the low temperature, which alone would have pro- 
longed the duration, the excessive rains greatly added to the delay. 
In general, then, it may be stated that the duration of the various 
stages of Heliothis are shortest under high temperatures with moder- 
ate rainfall; longer, except in egg and pupa, when ahigh, dry tempera- 
ture is maintained; longer still with much lower temperature; and yet 
again longer with lower temperature and excessive rains. 
Some atmospheric conditions also noticeably influence the behavior 
of the moths. The hot weather, dry, or somewhat rainy, seems to have 
‘but little diverting effect on the habits of the moths. When the tem- 
perature is much lower, and is accompanied with much rain, the moth 
adapts itself to the condition of things. The excessive rains last sea- 
son continued late in the evening and into the night. This of course 
covers the period of feeding and deposition. This seemed to have the 
effect of inducing the moths to fly and feed more freely during the mid- 
dle of the afternoon, when it was clear and warmer. When the rainy 
spell began to be a protracted one, the females were frequently seen at 
3 o'clock during the warm sunshiny afternoons busily engaged in de- 
positing their eggs. The instances in which deposition was observed — 
in daytime were confined mostly to this period, though some were ob- 
served under normal conditions. From this it follows that to a certain 
