flagella of the other strains and species. Considerable variation 

 was found in the wavelengths of the normal flagella of the differ- 

 ent species (see Table XIII). The shortest normal wavelengths 

 were found in Bacillus circulans and the longest in Bacillus mega- 

 therium. 



Bacillus sphaericus showed pH sensitive flagella. When stained 

 from a 1% dibasic potassium phosphate suspension the flagella 

 were all of normal curvature, but from a monobasic potassium 

 phosphate suspension they were mainly curly. 



Bacillus cereus and the Alexander-Jackson (A-J) strain showed 

 mainly normal flagella but mixed with the normal were some 

 flagella with shorter wavelength but not sufficiently short to be 

 labeled curly. The wavelength of these flagella averaged 1.6 

 microns in B. cereus and 1.5 microns in the A-J strain. The differ- 

 ence between these wavelengths and wavelengths of true curlv 

 flagella (1.1-1.25 microns) is readily apparent by direct observa- 

 tion. 



The flagellar wavelengths may be of considerable value in the 

 speciation of the genus Bacillus. However, to have any great 

 significance, many more strains must be studied than the author 

 has done to date. 



128 



