354 MR. E. B. POULTOISr OH THE COLOUR-RELATIOH BETWEEN EXPOSED 
darker, it is obvious that the first of the above questions is also answered in the 
negative. There is every reason for the belief that these results were not influenced 
by the blinding one way or the other. 
Thus 16 pupae were obtained from this series. 
IX.—A company of nearly mature larvae was found August 28 on a nettle-bed 
(at some distance from that on which Series VIIL was found) in a field by the canal 
close to Port Meadow. These were kept in large, clear, glass-roofed cylinders until full- 
fed, and as soon as they showed signs of leaving their food the following arrangements 
were made :— 
A. The object of this experiment was to make a decisive test of the reciprocal 
effects of the colours of neighbouring larvae when much crowded. In the morning of 
August 31, 16 larvae (having left their food) were selected, and 12 of them were 
placed in one of the smallest cylinders (8'0 centimetres high, 6'0 centimetres in 
internal diameter), resembling those described in Series V., B., having a similar roof, 
and background of glazed white paper, with about one-third of the circumference left 
clear, and facing a strong east light, being about one foot from the window. The 
floor, however, consisted of a sheet of “ opal.” glass. The other four larvae were 
placed one in each of four other cylinders of the same kind, arranged in a precisely 
similar manner. All these larvae, being much advanced, suspended themselves almost 
at once. 
September 1, 9.30 a.m. —All the four isolated larvae and 11 of the crowded ones 
had pupated, in most cases the change having taken place some hours. 
September 1, 11.30 a.m. —The last larva had now pupated. 
September 3.—The comparison was made between these pupae and a very large 
number of those of other divisions and series, i.e., with all compared August 29 and 
since that date. 
1 of the 4 isolated pupae was suspended on the clear side of the cylinder, 
towards light, low down, and only 8 mm. from edge of 
white background.It was (4), not much gold. 
1 ,, 4 isolated pupae was suspended on the side of the cylinder very 
high up and just inside the edge of the background . . ,, (5), but not extreme. 
1 „ 4 isolated pupae pupated on the white opal floor, not being 
fixed to anything.„ (4), rather more gold than 
the (4) above. 
1 „ 4 isolated pupae was suspended from the paper roof .... „ (5), like the above (5). 
