14 THE VIVARIUM. 
with an easily movable lid. This lid can be made by forming 
four narrow pieces of wood into a frame which will fit exactly 
into the top of the case, and over this frame securely nailing a 
sheet of finely perforated zinc. The little pin tacks, already 
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Fic. 6.—A SNAKE CASE AND A LIZARD CASE, BOTH HEATED BY THE 
SAME LAMP. 
spoken of, placed rather closely together, may be used. The 
zinc ought to be so cut that it will extend a little more than a 
lin. all round. This will prevent the lid from dropping into the 
case, as well as the animals, or evena fly, from getting out. Four 
