Fig. 56. w. Clostridium sp. 3679, McClung 174. Three strains of this 

 organism were studied. With the exception of a few partly curly and partly 

 normal flagella the flagellation was pure normal. This organism has highly 

 heat-resistant spores and is used in the canning industry as a check on steriliza- 

 tion. 



X, y. C. sporogenes, McClung 175. In .\ are shown the typical normal 

 flagella and in y the curly flagella. Of seven strains studied three were 

 pure curly types. In C. sporogenes the curly variant apparently is a stable 

 type. 



z, aa, bb, cc. C. tetanomorphiim, McClung 2038. The culture stained was 

 fairly far advanced into the spore stage and a younger culture perhaps would 

 show more flagella per individual. Pictured are several variants; normal, curly, 

 part curly and part normal, curly and normal on the same individual, and 

 double curvature. 



dd. C. tertium, McClung 1272. Two strains were studied and both were 

 well flagellated with predominantly normal flagella and some coiling tendency. 



ee. C aurantibiityricum, McClung 2038. The organism pictured has four 

 or five normal and two curly flagella. The culture was about half normal 

 and half curly with a few individuals with mixed flagella like the one pictured. 



ff. C. pasteurianum, McClung 308. Normal flagella with long wavelength. 

 No variants seen. 



gg. C. beijerinckii, McClung 1673. Normal but rather short flagella of long 

 wavelength. 



hh. C. roseum, McClung 653. This organism was well flagellated but the 

 flagella stained with considerable difficulty and always rather lightly. The 

 flagella were mainly of the curly type but interspersed among the curly flagella 

 were often flagella of very long wavelength and usually also coiled flagella. 

 The resemblance to C. acetobutylicum is so striking that a close relationship is 

 suggested. Best stains were obtained by doubling the tannic acid concentration. 



ii. C. acetohuttjlicum, McClung 633. The two strains of this organism 

 studied showed beautiful flagellation with a flagellar density equal to or sur- 

 passing such organisms as Proteus. The great majority of the flagella were of 

 the curly type, usually interspersed with flagella of very long wavelength and 

 often some coiled types. The flagella stained with some difficulty. The re- 

 semblance to C. roseum is striking. 



136 



