200 THE ENTOMOLOGIST. 
has been tried in this country, nor with what success, although, 
from the above facts being well known to our English Lepi- 
dopterists, it seems almost a foregone conclusion that the 
experiment has been tried.’ About the first week in June I 
planted a young cabbage in a pot, and taking a couple of 
females that were depositing their eggs placed them all 
under a bell-glass. They laid abont thirty eggs; and after a 
week had elapsed I examined them every morning for the 
hatching of the larva, which appeared on the 18th. I then 
remov ed half and placed them upon a mignonette plant, also 
in a pot; these I bred under a bell-glass in the shade of a 
tree in the garden. The other half were left on the plant and 
placed in a hothouse, where the temperature was 65° to 70°, 
rising to 80° by day, and 85° when the sun shone: they 
changed to pupe from the 30th of June to the 3rd of July, 
and emerged as perfect insects from the 9th to the 13th of July. 
The others, fed out of doors, were exactly a week later in 
changing to pupe, and came out from the 18th to the 21st. 
Now for the results. I could not perceive any difference in 
colour between those fed upon mignonette and the others 
fed in heat: they were all the ordinary form of P. Rape ; 
therefore it seems improbable that the food has anything to 
do with the change, as mine never tasted anything but 
mignonette from the day they were hatched. Now, it is well 
known that the variety of Gonepteryx Rhamni called 
Cleopatra, in which the orange spot on the upper wing is so 
enlarged as to be spread over nearly the whole of it, is found 
only in the south of Europe, and especially on the shores of 
the Mediterranean; and | think probably the yellow variety 
of P. Rape proceeds from the same cause, and is only 
another instance of the effect of increased warmth of climate 
in intensifying colour. Perhaps the failure of my experiments 
was due to my not having sufficient heat at command, as it 
was nothing like the temperature of some parts of North 
America. Mr. Curtis, in his ‘Farm Insects,’ mentions the 
capture near Oldham, in Lancashire, of a male specimen 
which had all the wings of a bright yellow colour. Have 
there been any similar captures in this country? If any 
readers of the ‘Entomologist’ have made similar experiments 
to mine, and been successful, 1 hope they will let us know 
the results; also any information with respect to where this 
