218 ON THE ORIGIN, &C. OF THE NATIVE RACES 
modified by their presence some of the races of central 
Africa. 
Lest it might seem an omission that I have not described 
the Mongol race as having penetrated into the wilds of 
America, I shall here state, that the few Esquimaux crania 
examined by me, have proved to be strictly American, nor 
have I ever seen the slightest approach to the Mongol 
head in any native American race. I have only further to 
observe, that most of the opinions offered in this memoir 
are founded not on theory or conjecture, but on an anato- 
mical examination of the crania of numerous races of men. 
For the opportunity of doing so, I am in a great measure 
indebted to Professor Jameson, and to Doctors Monro 
and Barclay, through whose politeness I was allowed to 
examine whatever specimens their valuable museums con- 
tained. I beg leave to offer my thanks to these gentlemen. 
The annexed table gives a comparative view of the mea- 
surements of the head in several remarkable varieties of the 
human race. 
Edinburgh, ) 
March 1. 1822. j 
