LEPIDOPTEROUS PUP/E AND THEIR SURROUNDING SURFACES. 
325 
condition in the way of illumination, &c., in common. Care was also taken that the 
amount and distribution of food-plant should be as nearly equal as possible in the two 
compartments. 
(a) Thirteen larvae were placed in one compartment, and, as eigdit of these were dead 
on August 13, three were added from the set described as Id., and three from that 
labelled E. On August 19 there were eight pupae, of which four were dead and 
discoloured, and of the others one was on the roof and three on the food-plant. The 
results were :— 
Of the 3 on the food-plant 
On the roof 
1 was (3). 
1 „ O)' 
1 „ ( 5 ) > 
1 „ (5)J 
With the splendid golden appearance wfliich 
is usual in these degrees of colour. 
4 
This was a very complete result as compared with those previously recorded, and 
left no doubt that the metallic appearance can be influenced in the most remarkable 
way by the use of surrounding surfaces with a corresponding colour. Such a conclu¬ 
sion will receive the most complete confirmation below. 
(/3) In the other compartment 12 larvae were placed after having been blinded as 
carefully as possible. The two pupae which were ultimately formed possessed the 
following degrees of colour :— 
1 on the food-plant . . . was (5). 
1 „ floor (brown paper) „ (3), but a light one. 
Here again the blinding produced no effect on the colour as far as the evidence 
goes. 
J. Two exactly similar white gas globes of “ opal ” glass were selected, and the 
open upper end of each was covered with white paper, each globe being placed on a 
perforated white plate. The lower end of the stem of the food-plant (in small and, 
as far as possible, equal amounts) passed through the perforation into water, while 
the leaves and stem above the plate were in each case introduced into the globe 
through its lower opening as the globe itself was lowered on to the plate. The 
globes were placed in a strong north light. 
(a) In one globe 10 larvae were placed, and by August 19 four had pupated upon 
the leaves of the food-plant in all cases, while three larvae were still feeding (three 
having died). 
Of the 4 pupse .... 1 was (3). 
3 were (5), typical. 
Hence the bright white surroundings produced very striking results. 
(/3) 10 blinded larvae were placed in the other globe, and five had pupated by 
