ANTHROPOLOGY: A. HRDLICKA 
407 
able work of Ramsay and Shields and Aston, as well as that of Renard 
and Guye, to the standard herewith shown to be more trustworthy. 
This paper is only a preliminary communication. A fuller report of 
the work will appear in the July number of the Journal of the American 
Chemical Society. Much more work upon the subject has already been 
finished, and yet more is in prospect. We hope that yet further ac- 
curacy may be attained in the future, bearing in mind the precautions 
to which attention has been called in this paper, and that the results 
may be capable of fruitful discussion. 
In conclusion, we are glad to express our indebtedness to the Carnegie 
Institution of Washington for some of the apparatus we have employed. 
Summary. — In the course of a series of determinations of capillary 
constants by measuring the capillary rise in fine tubes, the following 
precautions have been especially emphasized: (1) The detection and cor- 
rection of inequalities in the glass tubes employed were effected by the 
use of a reversible apparatus. (2) Reference of the capillary rise was 
made to an unrestricted flat surface 38 mm. in diameter, the largest 
ever used. It was shown that much smaller surfaces are too small 
and that the insertion of a capillary in the middle of a larger tube causes 
appreciable error by increasing the capillary effect of the large tube. 
(3) Especial care was taken that the true bottom of the meniscus should 
be read. (4) The weight of the fine meniscus was in each case allowed 
for, and a new approximate formula w^as suggested for its calculation, 
depending upon the observed height of the meniscus. 
Fleeding these precautions, determinations of the capillary constants 
of several important liquids were determined at 20° as follows: water 
14.861, benzene 6.721, toluene 6.736, methyl alcohol 5.832, ethyl alcohol 
5.793, isobutyl alcohol 5.823, ethyl butyrate 5.704. 
AN EXHIBIT IN PHYSICAL ANTHROPOLOGY 
By Ales Hrdlicka 
DIVISION OF PHYSICAL ANTHROPOLOGY. U. S. NATIONAL MUSEUM. WASHINGTON 
Presented to the Academy, June 8. 1915 
In the April number of the Proceeings of the National Academy 
OF Sciences, I pubHshed a brief account of "Some recent anthropological 
explorations," which were carried out under my direction or by myself, 
for the Smithsonian Institution and the Panama-California Exposition 
at San Diego, in different parts of the world. I shall now point, in an 
equally brief way, to the material results of these expeditions in relation 
with the Exposition. 
