240 GIGANTIC TERRESTRIAL SAURTANS. 
voured to show that the estabhshment of carni- 
vorous races throughout the animal kingdom 
tends materially to diminish the aggregate 
amount of animal suffering. The provision of 
teeth and jaws, adapted to effect the work of 
death most speedily, is highly subsidiary to the 
accomplishment of this desirable end. We act 
ourselves on this conviction, under the impulse 
of pure humanity, when we provide the most 
efficient instruments to produce the instantane- 
ous, and most easy death, of the innumerable 
animals that are daily slaughtered for the supply 
of human food. 
SECTION X, 
IGUANODON.* 
As the reptiles hitherto considered appear from 
their teeth to have been carnivorous, so we find 
extinct species of the same great family, that 
assumed the character and office of herbivora. 
For our knowledge of this genus, we are in- 
debted to the scientific researches of Mr. Man- 
tell. This indefatigable historian of the Weal- 
den fresh-water formation, has not only found 
* See PI. 1, Fig. 45, and PI. 24 ; and Mantell's Geology of 
Sussex, and of the South-east of England. 
