490 NATURAL HISTORY OF MAN. 



exist on the subject. The same two methods of argument 

 (of which we are anxious to convey the full value) apply 

 equally to the hair of the Negro ; which, though called 

 woolly, has no relation to wool, and is found to graduate 

 through a series of changes into the ordinary hair of the 

 European races in one or other of the many varieties which 

 these races present. 



The argument for the unity of the human species might 

 perhaps be sufficient, even if it ended here. But it is ex- 

 ceedingly strengthened from a source to which we have more 

 than once alluded, viz. the analogies presented by the 

 inferior species of animal life. We have already said that 

 Man physically considered (and it must be added intellec- 

 tually also) is subject to be thus questioned by analogy; 

 and this is pointedly true in the great question of species and 

 varieties. The exuberance of this topic is such that we can 

 give but a slight indication of it here. Those who desire to 

 pursue it further will find ample means of doing so in the 

 numerous works on Natural History, Physiology, &c., which 

 have lately appeared.* The main point in the argument is 

 this; that other species, and notably the races of domesti- 

 cated animals, exhibit varieties precisely of the same kind as 

 those occurring in mankind ; often more extensive in de- 

 gree, and in many cases derived from similar causes. The 

 outline of this argument, as applied to the horse, the dog, 

 the ox, the hog, the sheep, the domestic fowl, &c., will be 

 understood by every one. We know, and regard without 

 surprise, those vast diversities of size, figure, colour, habits 

 of life, and even instincts of action, which distinguish the 

 various breeds of these animals ; separating them all more or 

 less from what we may regard as the original stock of each 



* Without any undue preference, we would refer to the copious writings of 

 Dr. Carpenter on these subjects, as distinguished by great ability, and by very 

 exact knowledge brought down to the most recent time. 



