36 REPORT OF NATIONAL MUSEUM, 1906. 
several years, and the outcome has fully justified the time spent upon 
it. The investigations on the part of the Museum have been conducted 
by Mr. W. H. Holmes in prehistoric archeology, by Professor Mason 
and Doctor Hough in ethnology, and by Doctor Hrdli¢ka in physical 
anthropology. 
Doctor Hrdlicka continued his inquiries relative to the effects of 
preservatives on specimens of the brain, the weight of the brain in 
correlation with the weight of the body, the proportions of the cranial 
fosse, and the growth, physiology, and pathology of certain tribes of 
Indians. He also completed a study of 26 orang crania from Borneo. 
A number of visiting Indians were measured and facial casts of a few 
of them were made. 
The large Malaysian collection of ethnology from Dr. W. L. Abbott 
was the subject of investigation by Professor Mason and Doctor 
Hough, who have in preparation an illustrated descriptive catalog 
of its interesting specimens. The extensive ethnological material 
from the Museum-Gates expedition of 1905 is being worked up by 
Doctor Hough, whose report is well advanced. The latter has also 
commenced the writing of a bulletin on the distribution of the ancient 
Indian ruins of the Gila-Salt River region in the Territories of Arizona 
and New Mexico. The principal investigations in prehistoric archeol- 
ogy were conducted by Mr. Holmes and had reference mainly to the 
‘* Handbook” above mentioned. The condition and knowledge of the 
collections in this division were greatly advanced by his thorough and 
comprehensive researches. 
Mr. Maynard, assistant curator of technology, has completed a care- 
ful study of the Museum records bearing upon the subject of marine 
architecture, especially as illustrated by the many models received 
from the Bureau of Fisheries and other sources. Under authority 
from the officials of the Departments of War and of the Treasury, an 
examination of the records relating to the manufacture of arms for 
the United States Army and United States Navy is also in progress. 
Besides the investigations by members of the Museum staff, the 
collections in anthropology have been extensively consulted by experts 
from different parts of the country and from abroad, and in greater 
or less degree have been utilized in many important researches. 
A considerable part of the East Indian collections of mammals 
recently received from Dr. W. L. Abbott was worked up during 
the year, those from Engano and Karimata islands and the Rhio 
Archipelago by Mr. Gerritt S. Miller, jr., and those from Banka and 
Billiton islands by Dr. W. M. Lyon, jr. A number of special contri- 
butions, based wholly or mainly upon this material, were published, 
the more noteworthy being as follows: By Mr. Miller, on Malayan 
pigs and new forms of bats, on the monkeys allied to Macaca nemis- 
trina, and on two new civets; by Doctor Lyon, on the pygmy squirrels, 
