190 On Elucidating the Natural History of Man, 



from being the case ; and we shall speedily find that there re- 

 sult from these data, I do not say only intimate, but also two- 

 fold, connections, viz. links of analogy, and [links of causa- 

 tion : of analogy, because the variations of mankind, and those 

 of the domestic races of animals, follow the same laws, and ex- 

 hibit similar characters ; and of causation, because the various 

 modifications of our different domesticated races are produced 

 by the influence of man, variously modified by time, place, and 

 circumstance. Thus, as may at once be perceived, the consi- 

 deration of the races of the domestic animals, when introduced 

 into the discussion of anthropological problems, will elucidate 

 them by data of two kinds, and from this single, but twofold, 

 element two fertile sources of induction flow. 



Let us first examine the relations of analogy which exist be- 

 tween the variations in the races of domestic animals and those 

 of the human race ; let us endeavour to ascertain their nature ; 

 aud so far as possible to determine, and, so to speak, to mea- 

 sure their value. 



When we compare different individuals of a wild animal 

 which have been captured in regions which vary as to tempera- 

 ture, topography, and generally as to every thing comprehended 

 under the name of local circumstances, when we subject these 

 individuals to a sufficiently attentive examination, we always 

 succeed in discovering that there are differences more or less 

 marked among them. Except in the case which is altogether 

 foreign to our subject, of an accidental or teratological modifica- 

 tion, * the different traits of each of the individuals selected as 

 types of comparison are otherwise very far from belonging to it 

 alone ; they are likewise discovered in all the individuals which 

 live in the same countiy, and the same local circumstances, and 

 are regularly transmitted by procreation ; they theiefore charac- 

 terise hereditary varieties, or, in other words, and precisely in 

 the same sense in which the word is employed in regard to man 

 and the domesticated animals, races. 



* Considered iii the general, and not as I am now doing in a particular, 

 point of view, the question of the origin of races is very intimately allied with 

 various important questions of teratology, as I have shewn in many passages 

 of the 1st and 3d vols, of my Histoire Generate des Anomalies de l' Organisation. 



