298 THE VIVARIUM. 
k:); (17) the forelegs bud and are produced (Fig. 77, 7); (18) the 
tail is gradually absorbed, particle by particle ; (19) the branchial 
openings are closed by the opercula; (20) lungs develop as the 
branchize are absorbed; (21) the animal comes frequently to the 
surface of the water for air; (22) the tadpole often before the 
tail is fully absorbed leaves the water, at any rate for a time, and 
will take any suitable food it may find on land, and will reject, 
Fic. 77.—METAMORPHOSES OF THE FROG, showing 
the growth of the Embryo, from the egg to the 
Four-legged Tadpole. 
now, all food without life; (23) as soon as the tail is completely 
absorbed, the young creature adopts the habits of the mature 
Frog. 
As a rule, Reptiles and Batrachians should not be kept 
together in the same Vivarium. The latter animals naturally 
require a moister atmosphere than do the former. I was reminded 
of this fact very forcibly some time ago, when I thoughtlessly 
