NOTICE TO LIBRARIANS AND BIBLIOGRAPHERS 
On May 26, 1930, the name of the Hygienic Laboratory was changed by an act 
of Congress to the "National Institute of Health." This change of name does 
not affect the numerical continuity of the series of bulletins. The first bulletin 
was issued in 1900 and the series carried the name ''Hygienic Laboratory Bulletin 
No. — . " Hereafter the series will be named "National Institute of Health 
Bulletin No. — without change in series number. 
(II) 
