monas. The Salmonella growth will spread faster and more widely 

 than the Pseudomonas growth. In fact, semisolid agar stabs of 

 polar flagellated organisms may show so little spreading that they 

 appear nonmotile. 



Fig. 3. a, b, c, d, e, f . The variety of peritrichous flagella which have 

 been observed and are named in order, normal, curly, small amplitude, coiled, 

 semicoiled, and straight. 



g, h. Two examples of double curvature. Other types, not illustrated, may 

 be seen in Proteus. 



i, j. Examples of peritrichously flagellated bacteria with flagella of difi^erent 

 wavelength on the same individual. 



k, 1, rii. Mixed polar-peritrichous flagellation. 



n. The hooked flagellum is the normal one for this organism and is sub- 

 polar in origin. The exact origin of the other flagella is undetermined. 



o. Mixed lophotrichous-peritrichous flagellation. This is an unstable mutant. 



p. The nature and function of the spine-like structures is unknown. The 

 polar flagellum is unusually long but otherwise normal. 



a, b, e, h, i. From E. Leifson, S. R. Carhart, and M. Fulton, /. Bacteriol. 

 69, 73-82 (1955). c. From E. Leifson, and M. I. Palen, /. Bacteriol. 70, 233- 

 240 (1955). k. From E. Leifson, /. Bacteriol. 71, 399-400 (1956). 1. From E. 

 Leifson, and R. Hugh, /. Bacteriol. 65, 263-271 (1953). n. From E. Leifson, 

 and L. W. Erdman, Antonie van Leeuwenhoek, J. Microbiol. Serol. 24, 97-110 

 (1958). o. From T. P. Galarneault, and E. Leifson, Can. J. Microbiol. 2, 102- 

 110 (1956). 



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