20, THE VIVARIUM. 
air is admitted through the little perforated zinc doors at each 
This Vivarium is very useful for keeping amphibious 
animals throughout the winter when it is not intended to allow 
end. 
Fic. 12.—VIVARIUM FOR A CHAMELEON. 
them to hibernate. A small Alligator or Crocodile will do well in 
such a tank as this, which is easy to make, and, because of the 
position of the glass, very easy to see clearly into. Of course, if 
uot wanted, the heating arrangement can be dispensed with. 
