168 MANUAL OP MICROBIOLOGICAL METHODS 



Shaw, C, J. M. Stitt, and S. T. Cowan. 1951. Staphylococci and their classifica- 

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Smith, N. R. 1940. Factors influencing the production of acetyl-methyl-carbinol 

 by the aerobic spore-formers. J. BacterioL, 39, 757. 



— ■ , Gordan, R. E., and Clark, F. E. 1946. Aerobic mesophilic sporeforming 



bacteria. U.S. Dept. Agr. Misc. Publ. 5^9. 



Tittsler, R. P. 1930. The reduction of nitrates to nitrites by Salmonella pullorum 

 and Salmonella gallinarum, J. Bacterial., 19, 261-267. 



— , and L. A. Sandholzer. 1936. The use of semi-solid agar for the detection 



of bacterial motility. /. Bacterial., 31, 575-580. 



Untermohlen, W. P., and C. E. Georgi. 1940. A comparison of cobalt and nickel 

 salts with other agents for the detection of hydrogen sulfide in bacterial cultures. 

 J. Bacterial, 40, 449-459. 



Vera, H. D. 1949. Accuracy and sensitivity of fermentation tests. Sac. Am. 

 Bacteriologists, Ahs., 49th, p. 6. 



Wallace, G. I., and S. L. Neave. 1927. The nitrite test as applied to bacterial cul- 

 tures. /. Bacterial, 14, 377-384. 



Zipfel, H. 1912. Zur Kenntnis der Indolreaktion. Centr. Bakteriol, I Abt. Orig., 

 64, 65-80. 



Zobell, Claude E., and Catherine B. Feltham. 1934. A comparison of lead, bismuth 

 and iron as detectors of hydrogen sulphide produced by bacteria. J. Bacterial, 

 28, 169-176. 



