Smithsonian Institution 
Washington, D. C. 
ALL CORRESPONDENCE 
SHOULD BE ADDRESSED 
TO THE SECRETARY 
Sir: 
October 1906. 
I am authorized to say that the Smithsonian Institution, 
acting as the representative in the United States for the International 
Catalogue of Scientific Literature, desires the cooperation of -writers 
on scientific subjects in order that references to all of the originax 
work done in this country since January 1, 1901, may he promptly and 
completely published. The International Catalogue is limited to 
original contributions to pure science, mathematical, physical, and 
natural. 
Enclosed is a statement of your publications which.have 
been indexed here. Will you be good enough to return this statement 
and add in similar form the titles of any publications omitted. The 
index for the year 1905 is now in preparation, that for 1906 is not 
yet begun. 
The Institution will be glad to receive copies of re¬ 
prints or separates, and any suggestions from the point of view of the 
author as to the most important topics discussed in the paper will be 
of material value in the proper preparation of the subject index. 
Very respectfully yours. 
Assistant Secretary, 
In Charge(/of Library and Exchanges. 
Major Edgar A. Mearns, 
U. S. A. War Department, 
Washington, D. C. 
