378 MR. E. B. POULTON ON THE COLOUR-RELATION BETWEEN EXPOSED 
(8) This subdivision only consisted of the same two sets as those described in (y). 
The experiment is tabulated below :— 
Dates, &c. 
1 
2 
3 
4 
5 
9 larvae free in glass box. 
Sept. 4, 4.15 I’.M. . 
Cr 
Cr 
These larvae were free to sus- 
pend themselves among the 
K ^ » 
H ^ m 
black and gilt tubes surround- 
„ 6 P.M. . . 
l_j r-i 
Cr 
, * 
. . 
ing the other larvae. 
„ 9.15 p.m. . 
Qj O 
-OfirQ 
CD O 
br-'P 
Cr 
Cr 
ci ctN 
w. 
m 
h-j 
f—I 
Sept. 5, 9.50 a.m. . 
Pi- 
Pr 
tag-e I] 
about 
16 ln-s 
tage I] 
about 
16 ln-s 
OQ 
m 
„ 1.30 p.m. . 
P 
Pr 
Pr 
Results : Sept. 7 . 
Gold 
Black 
Black 
Black 
Gold 
1 pupa, isolated, was (3). 
below 
below 
below 
below 
below 
2 little nearer a tube gilt out- 
side than a black one were 
Injured, 
Light(3) 
Light(3) 
Light (3) Injured, 
both dark (3). 
but 
pupa 
but 
2 equidistant from a black and 
appears 
fell 
appears 
a gilt tube were both (2). 
to be 
down 
to be 
1 nearer black than gilt tube 
light (3) 
rather 
was (3). 
darker 
1 some distance from a black 
than 
tube was dark (3). 
light (3) 
1 little nearer gilt than black 
tube was (3). 
1 much nearer black than gilt, 
quite close to the black, was 
- light (3). 
9 
The results of the experiments with the tubes seem to be completely uniform, 
while the free pupae are on the whole decidedly darker; and, as in (y), the individuals 
do not exhibit any evidence of correspondence with the colours of surrounding tubes. 
This subdivision concludes the experiments with compartmented tubes in this 
series; they will be analysed at the close of the description of similar experiments 
in the next series. 
F. A few pupae were found among the food, &c., of the cylinders containing the stock 
of larvae, and these are interesting as affording a further criterion of the colours 
assumed, when there is little stimulus from surrounding surfaces, towards either the 
light or dark forms. 
In one of the cylinders containing the stock four pupae were found, of which 
two were lying on the plain deal floor (one light (3), one very light (3) ), while two 
were suspended from the side (one dark (3), one light (3) ). 
