380 MR. E. B. POULTON ON - THE COLOUR-RELATION BETWEEN EXPOSED 
[ 
Dates, &c. 
(a) 12 larvae transferred from stock to gilt. 
(/3) 8 larvae transferred from stock 
to black. 
Sept. 4, 3 p.m. . . . 
8 suspended larvae pinned on 
black surface. 
„ 3.15 p.m. . . 
12 suspended larvae pinned 
on gilt surface 
No change. 
„ 9 P.M. . . . 
No change. 
„ 9.15 p.m. . . 
ljustpu- 
pated 6 
hrs. on 
gilt 
No change in others . 
? J 5? 
,, 12 MIDNIGHT . 
ljustpu- 
pated 9 
hrs. on 
gilt 
1 pupated (less than 9 hrs. on 
surface) and 1 pupating (9 
hrs. on surface). 
Sept. 5, 9.55 a.m. . 
. 
. . 
All pupated some hours . 
All pupated some hours. 
Results of comparison, 
Sept. 7 
(3) . . 
Light (3) 
Of the 10 pupae— 
2 were (2) 
3 „ (3) 
3 „ light (3) 
1 was very light (3), 
unusual gold. 
1 was very light (4) 
with normal gold, 
but rather dark in 
otherrespects, red¬ 
dish posteriorly. 
10 
Of the 8 pupae—- 
1 was dark (3) 
2 were (3) 
5 were light (3) 
8 
With the normal moderate 
amount of gold on half the 
pupae. 
It is quite certain that the larvae of which the time of pupation is known only 
passed the latter half, or even less of Stage III., on the gilt or black surfaces, and it is 
equally certain that few of the others had been transferred for the whole stage; for, 
if we assumed that pupation took place in the majority of cases at 5 A.M., September 5, 
this would only leave 14 hours for Stage III. 
It is probably on this account that the colours show so little correspondence with 
the surfaces on which pupation took place, for there are even two (2) on the gilt 
surface, although these are compensated by the one (4) and the one very light (3). 
