174 



CONVERSATIONS O-N 



than at the top, so that the bottom of the arch 

 may make a small circle, and the top a larger 

 one : thus 



A, Key-stone of an arch; B, Arch completed. 



Now the moth goes on this principle. Its eggs 

 are shaped like the bowl of a wine-glass, and 

 the smaller end is put next to the branch. 

 They are all glued together, too, with a kind 

 of gum, which will not dissolve or melt in 

 water ; so that the rain cannot injure them. 

 Here is a picture of these eggs. 



Eggs of the Lackey-moth, xvound spirally round a twig of hawthorn; 



natural size, and magnified. 



" There is another insect, boys, which has 

 something like tweezers ; though I think they 

 resemble pincers most. r 



