LEPIDOPTEROUS PUPA3 AND THEIR SURROUNDING SURFACES. 
381 
B. In the next experiment the compartmented tubes were made use of which were 
described in Division E. of the last series. These experiments are also divided into 
subdivisions, each of which corresponds to a sheet of glass with all its suspended pupae 
covered and free, and therefore subjected to uniform conditions of illumination. 
(a) In the first experiment the larvae were covered with the tubes for nearly the 
whole of Stage III., and there were no free larvae among the tubes. The experiment 
is shown below :— 
Sept. 4, 4.40 p.m. 
Sept. 5, 9.50 a.m. 
l 
2 
3 
4 
5 
All covered 
P 
' 
with tubes soo 
P 
Mostly fal 
n, but not imn 
P 
len down 
lediately, after 
P 
suspension. 
Results, Sept. 7 . 
Gold below 
(4) 
Gold below 
Very light 
(3) 
Black below 
Very dark 
(3) 
Gold below 
(4) 
Rather dull, 
but fair 
amount of 
gold 
Dead 
Hence the tubes with the gilt chamber below produced much lighter results than 
those with the gilt chamber above; and it appears to be probable that the larvae were 
decidedly influenced towards the light side of normal, and therefore that but little 
of Stage III. had elapsed before the tubes were applied. 
(/3) The next experiment included larvae in tubes for all Stage III., others for part 
of the stage, and others free among the tubes. 
