INTRODUCTORY 5 



concerned, recent editions of the chart have merely been presented by the committee 

 and permission asked to put them on sale. 



The committee issued four further reports in the Journal of Bacteriology (1921, 

 1922a, 6, and c) before the manual was prepared. One of these reports (19226) pro- 

 posed certain revisions of methods in the case of the gram stain, fermentation, nitrate 

 reduction, indole and hydrogen sulfide production. The committee presented this 

 report at the 1922 meeting of the society with the recommendation that the revised 

 material be published as part of a " Manual of Methods for Pure Culture Study of 

 Bacteria." The committee was thereupon instructed by the society to publish this 

 manual, using the loose-leaf form of binding, with the understanding that new folders 

 be issued from time to time to keep it up to date. This was done, and the system con- 

 tinued till 1956, when, as explained above, it proved necessary to convert the manual 

 into book form and its name was changed to "Manual of Microbiological Methods." 



The Committee on Bacteriological Technic has seen the following changes in 

 personnel : 



1920 H. J. Conn,i K. N. Atkins, I. J. Kligler, J. F. Norton, G. E. Harmon. 



1921 H. J. Conn,i K. N. Atkins, G. E. Harmon, Frederick Eberson, Alice Evans. 



1922 H. J. Conn,i K. N. Atkins, G. E. Harmon, Frederick Eberson, F. W. Tan- 

 ner, and S. A. Waksman. 



1923 H. J. Conn,i K. N. Atkins, J. H. Brown, G. E. Harmon, G. J. Hucker, F. W. 

 Tanner, and S. A. Waksman. 



1924-5 H. J. Conn,i K. N. Atkins, J. H. Brown, Barnett Cohen, G. J. Hucker, F. W. 

 Tanner. 



1926-7 H. J. Conn,i Barnett Cohen, Elizabeth F. Genung, W. L. Kulp, W. H. 

 Wright; with G. J. Hucker and S. Bayne-Jones as a subcommittee on 

 serological methods. 



1928 H. J. Conn,i Victor Burke, Barnett Cohen, Elizabeth F. Genung, W. L. 



Kulp, W. H. Wright. 



1929-30 H. J. Conn,i Victor Burke, Barnett Cohen, Elizabeth F. Genung, I. C. Hall, 

 W. L. Kulp, W. H. Wright (deceased. May, 1929). 



1931-4 H. J. Conn,i Barnett Cohen, Elizabeth F. Genung, Victor Burke, I. C. 

 Hall, J. A. Kennedy. 



1935 H. J. Conn,i Victor Burke, Barnett Cohen, M. W. Jennison, J. A. Kennedy. 



1936-42 H. J. Conn,i J. H. Brown, Victor Burke, Barnett Cohen, C. H. Werkman, 

 M. W. Jennison, J. A. Kennedy, A. J. Riker. 



1943-5 H. J. Conn,i Victor Burke, Barnett Cohen, C. H. Werkman, M. W. Jenni- 

 son, J. A. Kennedy, L. S. McClung, A. J. Riker. 



1946-7 H. J. Conn,^ G. H. Chapman, Barnett Cohen, I. C. Gunsalus, M. W. Jenni- 

 son, L. S. McClung, A. J. Riker, C. E. ZoBell. 



1948 M. W. Jennison,! G. H. Chapman, Barnett Cohen, H. J. Conn, I. C. 

 Gunsalus, J. A. Kennedy, L.^ S. McClung, A. J. Riker, C. A. Stuart, C. E. 

 ZoBell. 



1949 M. W. Jennison,! G. H. Chapman, H. J. Conn, I. C. Gunsalus, L. S. Mc- 

 Clung, C. A. Stuart, A. J. Riker, C. E. ZoBell. 



1950 M. W. Jennison,! R. C. Bard, G. H. Chapman, H. J. Conn, I. C. Gunsalus, 

 L. S. McClung, C. A. Stuart, A. J. Riker, C. E. ZoBell. 



1951-2 M. W. Jennison,! R. C. Bard, G. W. Burnett, H. J. Conn, H. C. Lichstein, 

 L. S. McClung, A. P. McKee, M. J. Pelczar, A. J. Riker, C. A. Stuart, C. E. 

 ZoBell. 



^ Chairman. 



