260 Experiments upon the colowr-relation, &c. 
were added in Stage III. Hence we see strong confirma- 
tion for the susceptibility of the larve in the earlier 
stage, as found by Mr. Poulton. 
IV. Yellow. 
A. The tissue-paper was of a strong mustard-yellow 
colour. ' 
Data.—Twelve larve employed, all of which pupated: 
on various days between Sept. 2nd and 18th. 
Results.— 
1 pupa was light (8), yellowish and typical, but with, perhaps, an 
unusual absence of black pigment patches. 
2 pups were (4), both typical and greenish. 
aaa »» pale (5), 2 very pale yellowish green, with black 
patches unusually developed; 1 similar, 
but somewhat deeper in colour, typical. 
6x55 5, deep (5), 3 distinctly green, but not very bright, some- 
what unusual black patches; 3 bright 
— green; 1 with extremely little pigment. 
12 
The production of green is here most striking. The 
colour is in the extremest cases a bright emerald-green, 
considerably stronger than the deepest green figured on 
Mr. Poulton’s plate. The colour used by Mr. Poulton 
was of a lighter shade, but the results confirm each 
other in a most interesting manner, for Mr. Poulton 
also found that Yellow (and Orange also) produced far 
stronger effects in the direction of green than are caused 
by Green itself. , 
B. In this case also an attempted conflicting colour 
experiment is best included here, for the larve were 
treated as above described until Stage III. 
Data.—Of nine larve (a), (b), (ec), and (d) had Black 
paper introduced posteriorly in Stage III.; (e), (7), and 
(g) had Black introduced anteriorly ; (kh) had Blwe added 
anteriorly ; (2) had Blue added posteriorly. 
Results.— 
(a) was a deep (5), typical, the green exceedingly distinct and deep. 
(6) 4, » (5), typical. 
(c) ,, pale (5), with well-marked patches. 
(da) ,, light (4), pinkish. 
(e) ,, pale (5), dead; but Mr. Griffiths had noted, ‘‘ Bright green, 
yellow median line, and angles almost un- 
spotted.” 
