‘Z 
Pond Life 
oill-breathing-from-water animals being 
changed into lung-breathing-from-air 
land animals, it would be difficult, if not 
impossible, for us to understand how the 
great change from simple creatures with- 
out limbs, or indeed any other features 
by which we generally recognize an 
animal, to the present condition of life 
has gradually come to pass. 
For as the water was peopled with 
living things before the land, these 
changes of the frog and newt help us 
over the chief difficulty. To leave the 
water and live on the land must have 
been, for fish-like creatures, a matter of 
some difficulty ; and if we were not able 
to see it done with our own eyes, we 
should be inclined to say that it was 
an impossibility. As it is, with such 
common examples before us to be found 
