182 THE OX TRIBE. 



size upon abundance of food, &c. In wild animals, how- 

 ever, these varieties are greatly limited by the natural 

 habits of the animal, which does not willingly migrate 

 from the places where it finds, in sufficient quantity, what 

 is necessary for the support of its species, and does not 

 even extend its haunts to any great distances, unless it 

 also finds all these circumstances conjoined. Thus, 

 although the Wolf and the Fox inhabit all the climates 

 from the torrid to the frigid zone, we hardly find any 

 other differences among them, through the whole of that 

 vast space, than a little more or less beauty in their furs. 

 The more savage animals, especially the carnivorous, 

 being confined within narrower limits, vary still less ; and 

 the only difference between the Hyeena of Persia and that 

 of Morocco, consists in a thicker or a thinner mane. 



Wild animals which subsist upon herbage feel the 

 influence of climate a little more extensively, because 

 there is added to it the influence of food, both in regard to 

 its abundance and its quality. Thus the Elephants of 

 one forest are larger than those of another ; their tusks 

 also grow somewhat longer in places where their food 

 may happen to be more favorable for the production of 

 the substance of ivory. The same may take place in 

 regard to the horns of Stags and Rein-deer. Besides, 

 the species of herbivorous animals, in their wild state, 

 seem more restrained from migrating and dispersing than 

 the carnivorous species, being influenced both by climate, 

 and by the kind of nourishment which they need. 



.We never see, in a wild state, intermediate pro- 

 ductions between the Hare and the Rabbit, between the 

 Stag and the Doe, or between the Martin and the 

 Weasel. Human artifice contrives to produce all these 



