632 LABORATORY EXERCISES 



I Gelatin liquefied. 



2 Gelatin not liquefied. 



0.1 Add and gas from dextrose. 



0.2 Acid without gas from dextrose. 



0.3 No add from dextrose. 



0.4 No growth with dextrose. 



o oi Add and gas from lactose. 



o. 02 Add without gas from lactose. 



0.03 No add from lactose. 



0.04 No growth with lactose. 



o. 001 Add and gas from saccharose. 



0.002 Add without gas from saccharose. 



o. 003 No add from saccharose. 



o 004 No growth with saccharose. 



o.oooi Nitrates reduced with evolution of gas. 



0.0002 . . Nitrates not reduced. 



0.0003 Nitrates reduced without gas formation. 



o.oocoi Fluorescent. 



o. 00002 . Violet chromogens. 



o . 00003 Blue chromogens. 



0.00004 Green chromogens. 



o . 00005 YeUow chromogens. 



0.00006 Orange chromogens. 



o. 00007 Rsd chromogens. 



0.00008 Brown chromogens. 



o. 00009 Pink chromogens. 



o . 00000 Non-chromogens. 



o . oooooT Diastatic action on potato starch (strong) . 



o. 000002 . . Diastatic action on potato starch (feeble). 



o. 000003 Diastatic action on potato starch (absent). 



o . ooooooT Acid and gas from glycerin. 



o . 0000002 Add without gas from glycerin. 



o . 0000003 ^o ^^^ from glycerin. 



o . 0000004 . No growth with glycerin. 



The genus, according to the system of Migula, is given its proper symbol which 

 precedes the member thus: According to the above the symbol of Bacillus coli 

 would be B. 222.HI102 and oi Pseudomonas campeslris Ps. 211. 333151. This will 

 be found useful as a quick method of showing close relationships inside the genus, 

 but is not a suffident characterization of any organism. The descriptive chart of 

 the Society of American Bacteriologists of which the above dedmal system forms 

 a part will be found useful in the detailed systematic study of the bacteria. It was 

 prepared by F. D. Chester, F. P. Gorham and ICrwin F. Smith, appointed as a 

 committeemen methods of identification of bacterial species. Their report was 

 endorsedby the society at the annual meeting, December, 1907. 



