346 Morton's Crania Americana. 
ion are extremely partial, forming mere exceptions to the primi- 
tive aud national tint that characterizes these people, from Cape 
Horn to the Canadas. The cause of these anomalies is not 
readily explained ; that it is not climate is sufficiently obvious ; 
and whether it arises from partial immigrations from other coun- 
tries, remains yet to be decided.” 
Buffon defines species—‘‘ A succession of similar individuals 
which reproduce each other.” Cuvier also defines species— 
“The union of individuals descended from each other or from 
common parents, and of those who resemble them as much as 
they resemble each other.” “The apparent differences of the 
races of our domestic species,” says Cuvier, “are stronger than 
those of any species of the same geuns.” ‘ The fact of the sue- 
cession, therefore, and of the constant succession, constitutes alone 
the unity of the species.” Flourets, who cites these definitions, 
concludes that “ unity, absolute unity, of the human species, and 
variety of its races, asa final result, is the general and certain 
conclusion of all the facts acquired qanpeaning the natural his- 
tory of man.”’* 
» Dr. Morton, while he assumes the unity of the species, con- 
ceives that “each race was adapted from the beginning (by an 
all-wise Providence) to its peculiar local destination. In other 
wopls, that the physical characteristics which distinguish the 
Te ne races, are  sesanepiiays of external causes.’ 
nce derives support from the fact adverted to by Dr. 
Caldwell, in his “Thoughts on the Unity of the Human Spe- 
cies.” Tt is,” says he, “ 4179 years since Noah and his family 
came out of the ark. They are believed to have been of the 
Caucasian race.” ‘3445 years ago, a nation of Ethiopians is 
known to have existed. Their skins, of course, were dark, an 
they differed widely from the Caucasians in many other particu- 
lars. ‘They migrated from a remote country aud took up their 
residence in the neighborhood of Egypt. Supposing that people 
to have been of the stock of Noah, the change must have been 
completed, and a new race formed, in 733 years, and probably in a 
much shorter period.”+' Dr. Morton observes, that. ‘the recent 
discoveries in Egypt give additional force to the preceding state- 
oe eee i Ns ene 
* Flourens’ article before cited, and the Edin, New Philosophic. Journ., Vol. 
xxvii, p 358, October, 1839. 
+P.72. Phila. 
. 
