258 Experiments upon the colour-relation, de. 
require to be given separately. (a) attached itself to the 
side of the jar which was in shadow; a slip of opaque 
and strongly-coloured Blue paper was placed under- 
neath the posterior half of the caterpillar’s body, and a 
slip of gilt paper beneath the anterior thoracic half. 
(b) treated similarly, but had attached itself on the 
illuminated side of the jar, and the same colours were 
applied in reversed position. (c) had a slip of Black 
paper similarly placed below the thoracic half, and Gold 
under the abdomen. (d) had the anterior half over a 
background of a strong bright Red opaque colour, and 
the posterior half backed by Green (the same tissue- 
paper as was used in Series I.). During the pupal ecdysis 
the attachments gave way, and it fell to the bottom of 
the white jar. ; 
Results.— 
(a). The pupa was a typical (2), with a yellowish-pink ground 
colour. 
(b). The pupa died, but it had been previously described by 
Mr. Griffiths in these words :—‘‘ Greenish-grey ; abdomen 
light, median stripe with distinct spots; angles spotted, 
but not the area.” 
(c). The pupa was a typical (4), with a yellowish ground colour. 
(d). The pupa was a typical dark (3), with a pinkish ground colour. 
These results form but an imperfect test of the influence 
of white surroundings, and some of the effect was no 
doubt interfered with by the other colours, but the 
numbers are too few and the results too diverse to 
attempt to draw conclusions. 
III. Pink. 
A. Tissue-paper of a very pale colour, much liable to 
fade upon exposure to light, as indeed occurred in most 
of the experiments. 
Data.—Sixteen mature larve were exposed to this 
influence, and all duly pupated between August 26th and 
September 15th. 
Results.— 
4 pupe were dark (3), 3 being typical and pinkish (1 deformed), 
and 1 yellowish, with pigment patches 
strongly marked. 
Es ie sf (8), 1 typical and pinkish; 1 greenish, with 
patches well-developed; 1 yellowish, with 
patches well-developed. 
