122 LIFE AND HER CHILDREN. 
were not for the birds which devour both slugs and 
snails at their work, and some insects which destroy 
their eggs, the whole land would be eaten up by 
them ; for they hide their eggs so cunningly in 
the roots of plants, in crevices, and well -sheltered 
nooks, that they multiply by millions. 
Snails and Slugs. 
A, Garden snail.* B B, Testacella;t one disappearing into the 
ground, and only the tail showing. C, The Great Gray Slug.J 
s, Shell ; /, tentacles ; e, eyes ; b, breathing-hole. 
Yet, even kept down as they are, there is not vege- 
table food enough for all kinds, and many feed on 
* Helix. + Testacella. J Limax. 
