APPENDIX B 135 



BRIEF CHARACTERIZATION (continued) 



NOTES 



(1) For decimal system of group numbers see Table I. This will 

 be found useful as a quick method of showing close relationships 

 inside the genus, but is not a sufficient characterization of any 

 organism. 



(2) Gelatin stab cultures shall be held for six weeks to determine 

 liquefaction. 



(3) Ammonia and indol tests shall be made at the end of the tenth 

 day, nitrite tests at the end of the fifth day. 



(4) Generic nomenclature shall begin with the year 1872 (Cohn's 

 first important paper). 



Species nomenclature shall begin with the year 1880 (Koch's dis- 

 covery of the poured-plate method for the separation of organisms). 



(5) Chromogenesis shall be recorded in standard color terms. 



