10 
The difficulties mentioned in Bulletin 49. in connection with secur- 
ing access to representative files of pharmaceutical and chemical 
periodicals, have not as yet been overcome. The local libraries, 
while perhaps second to none in some departments, appear to be 
quite deficient in matters relating to pharmacy and pharmaceutical 
chemistry. 
Through the courtesy of the librarians of the Philadelphia College 
of Pharmacy, the Philadelphia College of Physicians, the Franklin 
Institute. Philadelphia, and the University of TCisconsin. the com- 
pilers have had access to a number of periodicals not on file in the 
city of 'Washington. Even with these several libraries to draw from, 
however, they have failed to find a number of representative foreign 
journals. Thus they have been unable to find a file of the Pharma - 
ceutisch Weekblad for 1906. one of the acknowledged authorities in 
pharmaceutic matters, and a journal in which many of the best phar- 
macists in Holland and northern Europe generally publish their work. 
In addition to the libraries enumerated above, the thanks of the 
compiler- are due to the librarians of the United States Department 
of Agriculture, the Office of the Surgeon-General. U. S. Armv. and the 
Library of Congress for uniform courtesy and many kindnesses in 
connection with the loan of files of the several periodicals consulted. 
Dr. Eobert A. Hatcher, professor of pharmacology. Cornell Uni- 
versitv. Yew York, while temporarilv connected with the Hvgienic 
Laboratory. United States Public Health and Marine-Hospital Serv- 
ice. compiled many of the abstracts from the regular medical publi- 
cations and otherwise assisted in the preparation of this bulletin. 
In conclusion, the compilers would again call attention to the 
fact that they have endeavored to collect all of the available sug- 
gestions without comment and would reiterate the statement made 
in the preface of Bulletin 49 that while they appreciate the fact that 
many of the suggestions and claims here presented are not practi- 
cable. they are nevertheless valuable in that they are suggestions 
and serve to emphasize the care that must be exercised in the final 
utilization of these suggestions in connection with the revision of 
the Xational standards. 
They also wish to express their appreciation of the shortcomings 
of the compilation as presented and to assure members of the medical 
and pharmaceutical professions that, in so far as they may be able, 
they will endeavor to profit by any suggestions that may be offered 
for improving the stvle or the content of future bulletins. 
M. I. W. 
M. G. M. 
Diyisiox of Pharmacology. 
Hygieaic Labobatoby. 
September I. 1909. 
