ENTOMOLOGICAL INSTRUMENTS, &C. 555 



cover and do well. You will often meet Lepidopterous 

 larvae travelling over roads and pathways : at such times 

 they have usually done feeding, and are seeking a spot 

 in which they may assume the pupa with safety. These 

 you may place in one of your cells, and they will select 

 a station for themselves. You must be careful frequently 

 to examine the boxes in which you have pupae, that you 

 may take the imago as soon as it appears, and before it 

 has had time to injure itself in attempting to escape. I 

 mentioned to you on a former occasion Reaumur's expe- 

 riments to accelerate the appearance of the butterfly a ; 

 there is another still more remarkable, to which he had 

 recourse for this purpose : it was by hatching his pupae 

 under a hen ! ! You will wonder, perhaps, how this 

 could be effected, and be disposed to maintain that the 

 pupae must be crushed by the weight of the brooding 

 animal. How did the ingenious and illustrious expe- 

 rimentalist prevent this ? He prepared a hollow ball of 

 glass, open at one end, about the shape and size of a 

 turkey's egg. Having several chrysalises of the nettle- 

 butterfly ( Vanessa Urticte) suspended to a piece of paper, 

 he cut out some of these singly, with a square portion of 

 the paper attached to them, and covered with paste the 

 side opposite to that from which the chrysalis was sus- 

 pended : these he introduced into the ball through the 

 aperture, placing them as near to each other as possible, 

 taking care so to apply the pasted surface to the inside of 

 the ball, that when the side to which they were fixed was 

 uppermost they all hung as from a vault. This being 

 done, he stopped the aperture with a linen plug, but not 



a VOL. III. p. 262. 



