362 
MR. E. B. POULTON ON - THE COLOUR-RELATION BETWEEN EXPOSED 
lighter degrees, and the single (5) may have been merely an individual which tended 
especially strongly in this direction. The results nevertheless suggested a course of 
experiments which would be likely to give very interesting results, but which I had 
not time or material to undertake. The suggested experiments were to ascertain the 
effects produced by some powerfully acting colour (as gold) under different conditions 
of illumination. On theoretical grounds it is unlikely that the ratio between the two 
will prove to be direct, but it is to be expected that diminution in illumination will 
not be attended by a corresponding diminution in effect. 
The number of pupae obtained in Series IX. was 76 , and it is therefore probable 
that the whole of a rather small company was obtained. 
X.—A. The remnant of a company w r as found August 29 near South Hincksey. It 
was arranged to make use of the few larvae (eight only) in an experiment to further 
test the effect of transference during Stage III. into a colour with an influence 
opposite to that of the colour to which the larva had been previously exposed. 
The experiment was conducted as follows. The gilt box and drum and a black 
cylinder were made use of:— 
Aug. 29, 7 p.m. . 
„ 8.30 p.m. 
Aug. 30, morning, 
early 
,, 11.30 A.M. 
„ 1.20 p.m. 
,, 1.50 p.m. 
,, afternoon 
„ evening . 
Aug. 31, 9 a.m. 
,, 9 P.M. 
Compartment of gilt box. 
Gilt drum. 
Black cylinder, with black 
roof and floor. 
8 larvae put in compart¬ 
ment, having been cap¬ 
tured about 5 p.m. 
4 moved into gilt drum 
Food hardly touched, larvae 
crawling up sides or 
motionless on roof 
77 
1 suspended . 
7? 
77 
2 suspended altogether. 
2 pupated some time, 
1 suspended 
The last pupated recently. 
1 larva died. 
4 larva; introduced. 
Food hardly touched, larvae 
crawling up sides or 
motionless on roof. 
77 
1 suspended. 
Another suspended, and at 
once moved into black 
surroundings 
Another suspended and 
similarly transferred 
2 pupated some time, the 
time of suspension of 
1 not noted 
1 larva only just sus¬ 
pended, moved from gilt 
drum. 
A second larva introduced. 
i 
2 pupated : not long, as 
they have not darkened 
completely yet. 
Results : Sept. 1. 
The 3 pupae were all (4), 
The 2 pupae were both 
The 2 pupaa were both 
Compared with all 
not much gold, but quite 
(4), not much gold, but 
typical (4), with typical 
examined on 
light-coloured, 1 rather 
quite light 
gold; thus the most 
this day, and 
darker than any of the 7 
golden of the 7, but all 
45 examined 
are equally light, except 
Aug. 29 
1 of those in compart- 
ment of gilt box. 
