380 Dr. Wallace on the Oak-feeding 
that the thick integument about the anus, which was white on 
emerging from the egg, was changed in one hour to a velvety- 
black colour. On the oak tree upstairs two larvee were found 
dead, dried up and shrivelled ; and one other, with dried frass 
attached to the anus, was in a dying state. I was unable to find 
more than five empty egg-shells this morning, though seven larvee 
were found crawling about the tray as if newly-born, and as the 
oak boughs overhung the eggs, it was possible that two larve 
had dropped from the bough; I searched several times diligently 
for the empty egg-shells, but they did not appear, so I was left 
in doubt: but every morning when I removed the young larvee 
just hatched, I was careful also to remove the empty egg-shells, 
in order to prevent confusion in my numbers; and it was not 
always easy to find these empty shells, as they differed in appear- 
ance in no respect from the full ones, except in having an aper- 
ture, and if the aperture happened to be beneath, or if two egg- 
shells stuck together and the aperture was situate on the inner 
side, it was difficult to detect the empty one, and I had fre- 
quently to turn over each egg with my brush several times before 
finding the empty shells. Of these seven larvz placed on an oak 
tree in the greenhouse, one was found twice on the floor, and the 
third time disappeared entirely ; the remaining six, together with 
two others which had emerged during the day and were placed 
with them, were all right at night; they were well syringed with 
a hydropult, temperature 60°—75°; the larvae evinced an incli- 
nation to climb to the highest twigs of the tree: upstairs the re- 
fraicheur was freely used ; the habit of vagabondizing was appa- 
rently excited in the larve in the greenhouse by the greater ex- 
posure to the light and sun’s rays, and by the greater heat. 
May 9th. Minimum temperature upstairs 60°, in greenhouse 
51°; no sunshine, dull morning, The eight larve in the green- 
house were counted, and found all right; they had fed. Upstairs 
twenty-eight were on the tree, two only had died since the beginning, 
one escaped in the greenhouse; thirty-six remained out of thirty- 
nine born. During the day those upstairs wandered about very 
much, and one more was missed in the greenhouse, seven only 
being found on the tree in the evening; at 3 p.m. the hydropult 
was used, and the house shut up for the night, by this means a 
warm steamy temperature was maintained. During the afternoon 
some ladies came to see my insect cabinets, which were in the 
same room with the larva: upstairs. While exhibiting the drawers 
a strong odour of camphor was given out: possibly it was from 
