10 CORE. PVOL. Hie 
Hyatt, for the opportunity of examining Hindu and Chinese 
crania in their museum. The collection of the Army Medical 
Museum at Washington is especially important on account of 
the Kanakas, Esquimaux, Peruvians, and North American In- 
dians which it possesses. I am under great obligations to its 
distinguished director, Dr. J. S. Billings, for the facilities which 
he placed at my disposal. The museum of the Philadelphia 
College of Physicians contains the collection made by the late 
Professor Hyrtl of Vienna, of crania of Eastern and Mediterra- 
nean Europeans. In this department it is unrivalled, and I am 
greatly indebted to the council of the college, and its curator, 
Dr. Guy Hinsdale, for the opportunity of examining it. Some 
French skulls in the University of Pennsylvania were of value 
in the investigation. My own collection, though small, contains 
a number of Maoris, Australians, Tahitians,! and North Ameri- 
can Indians, which have proved to be of importance. Of Eng- 
lish and Europeo-American crania, I have been able to examine 
but few of what might be termed the thoroughly amalgamated 
race. Of the latter there are probably many crania in the war 
collection of the Army Medical Museum, but how free the race 
of each may be from foreign intermixture, of course it is impos- 
sible to know. In selecting such as are supposed to be “stock 
Americans,” those of persons with English names have been 
preferred, although many now true Americans are of German 
ancestry. In order to increase the list of this class of examina- 
tions, I have imposed on the forbearance of my friends by fre- 
quent inspections of their dentitions in ove aperto. 
I suspect that the characters thus obtained will prove of im- 
portance in a zodlogical and ethnological sense. They have 
been already found to be of great fixity, and hence significance, 
in the lower mammalia. The only reason why they should be 
less so in man is, that the modification in reverting to the 
tritubercular molar is a process of degeneracy, and may be hence 
supposed to be less regular in its action than was the opposite 
process of building up, or addition of the posterior internal 
cusp. Some justification for a light estimate of its value may 
1 For the Maori and Australian skulls, I am indebted to Mr. Speechey Gotch of 
Melbourne; and for the Tahitians to Dr. Chassaniol, Chef de la departement de Santé 
de Taiti, of Paris. My best acknowledgments to these gentlemen are hereby ex- 
pressed. 
