20 LIFE AND HER CHILDREN. 
chalk. Look at the little wriggling creatures at I, 
Fig. 3, small as they look here, they are drawn many 
thousand times larger than they really are in life, 
and yet they are much more perfectly formed than 
either the thread -slime or the finger-slime. They 
have actually a kind of skin, and do not throw out 
threads here and there, but are provided with a little 
Fig. 3. 
Infusoria, all immensely magnified. 
I, A group of monads.* 2, The Night-glow, t 3, Bell-flower.J 
whip of slime, which they lash to and fro, and so drive 
themselves through the water. These microscopic 
forms called monads grow up in water in which flowers 
have stood for many days till their stalks begin to de- 
cay, and in infusions of hay or straw, made by pouring 
hot water upon them and letting it stand ; and for 
this reason the little beings are called infusoria. In 
* Monas. f Noctiluca. i Vcrticella. 
