i<4-8 PURE CULTURE STUDY OF BACTERIA 



over by a committee of broader scope then appointed and called the 

 Committee on Bacteriological Technic. This committee was appointed 

 with the understanding that its membership should fluctuate from 

 year to year in order to keep on it men actively interested in the work. 



The new committee made a further revision of the chart, which 

 was presented at the 1920 meeting and endorsed by the Society. 

 Later editions of this chart have been drawn up by the committee in 

 the years of 1924 and 1929, but neither of these have been submitted 

 to the Society for official endorsement. In order to avoid committing 

 the Society in favor of any of the methods concerned, recent editions 

 of the Chart have merely been presented by the committee and per- 

 mission asked to put them on sale. 



The committee issued four further reports in the Journal of Bacte- 

 riology, (1921, 1922 a, b, & c) before this Manual was prepared. 

 One of these reports (1922b) proposed 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. 



The Committee on Bacteriological Technic has seen the following 

 changes in personnel : 



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



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



1922 H. J. Conn, K. N. Atkins, G. E. Harmon, Frederick Eberson, F. W. Tanner, and 

 S. A. Waksman. 



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

 Tanner, and S. A. Waksman. 



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



Tanner. 

 1926-7 H. J. Conn, Barnett Cohen, Eliz. F. Genung, W. L. Kulp, W. H. Wright; with 



G. J. Hucker and S. Bayne-Jones as a sub-committee on serological methods. 

 1928 H. J. Conn, Victor Burke, Barnett Cohen, Eliz. F. Genung, W. L. Kulp, W. H. 



Wright. 

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



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

 1931-4 H. J. Conn, Barnett Cohen, Eliz. F. Genung; Victor Burke (pathological 



methods); I. C. Hall (anaerobic methods); .J. .\. Kennedy (serological methods). 

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

 1936-42 H. J. Conn; .1. H. Brown (anaerobic methods) Victor Burke, (pathological 



methods); Barnett Cohen, C. H. Werkman, (biochemical methods); M. W. 



Jennison, (the Descriptive Chart); J. A.Kennedy (serological methods); A. J. 



Riker (plant pathological methods). 



