OF TILGATE FOREST. 
277 
feed, but do not chew them ; and the teeth, wlien 
worn, present an appearance of having been chipped 
offi and never like the fossil teeth of a ground, 
surface ; and it is certain that if the Iguanodon had 
chopped 0^' its food like the Iguana, its teeth could 
never have presented the appearance which the 
illustrious Cuvier considered so extraordinary, and 
which led him to mistake the tooth of a rejitile for 
that of a rhinoceros. Now, “ as every organic in- 
dividual forms an entire system of its own, all tlie 
})arts of which mutually correspond, and concur to 
produce a certain definite ])urpose by reciprocal 
reaction, or by combining towards the same end,” 
it follows from the pecidiar structure of the fossil 
teeth alone, that the muscles which moved the jaws, 
and the bones to which they were attached, were 
widely different from those of any of the living 
lizards ; and consequently, the form of the head 
of the Iguanodon must have been modified by these 
causes, and have differed from those of existing 
reptiles. Since the vegetable remains with which 
the teeth of the Iguanodon are associated, consist 
principally of those tribes of plants that are fur- 
nished with tough thick stems, and which, pro- 
bably, were the principal food of the original animal, 
this peculiar structure of the teeth was evidently 
required, and beautifully adapted, to enable the 
animal to accommodate itself to the condition in 
which it was placed. Hereafter, perhaps, some 
more fortunate observers may discover a portion of 
the head or jaw, and be able to confirm or refute 
these coniectures. 
T 3 
