NO EYES, AND MULTIPLE EYES 215 
there for ten years. In a wild state the reptile 
feeds upon worms, slugs, small lizards, and 
frogs, but those the writer has known in a 
captive state were very partial to a diet of 
dead mice. 
A very specialized type of eye is possessed 
by the arthropods or invertebrate creatures 
with jointed legs, such as the spiders, crustaceans 
and various forms of insects. Known as 
compound-eyes, these organs consist externally 
of a number of facets, each of which produces 
a separate image. 
It must not be assumed, however, that 
animals with compound eyes have a keener 
sight or greater field of vision than those 
without, for it is generally believed that the 
former type of eye is adapted more for the 
purpose of detecting movement than for the 
reception of actual images. 
Whether it is possible for an animal actually 
to visualize more than one image at a time is 
a question that the writer does not profess to 
be able to answer, yet in the chameleon we have 
a creature that can move each eye independently 
of the other, so that the one may be looking 
below and the other above, or one in a forward 
and another in a backward direction. Such 
being the case, it would not be unreasonable 
to expect that the eyes are capable of receiving 
