THE MUSEUM'S COLLECTION OF LIFE CASTS 



WITH PHOTOGRAPHS ILLUSTRATING THE METHOD OF MAKING DUPLICATE 

 CASTS FOR EXCHANGE WITH OTHER INSTITUTIONS 



THE origin of the primitive races of the New World and their possible 

 relations to the geographically isolated races of the Old World is 

 one of the most interesting questions of ethnological research, 

 which if it ever comes to anything must needs reach its results through com- 

 parative study of the races themselves in their physical types and their 

 cultures. In this country especial interest has attached to study of the 

 Indian tribes of the northwest coast of North i\merica for comparison with 

 northern Asiatic tribes, with a view to establishing proofs of the deri\'ation 

 of the western tribes from the eastern, or at least of a mingling of the two 



M(Kl(!l of a head of which duplicate casts are desired. Tlie model is covered with a 

 half-inch thickness of clay [a small part of the clay is cut away to show tho face of the 

 model underneath] and a two-piece plaster mold is made over the clay. ■ When tho plaster 

 has hardened, the mold is taken ofT, and the clay is removed from the model 

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