362 Vera?ius Alva Moore 



differences there are likewise striking resemblances. A few 

 of the more important facts which have been brought out in 

 this study to illustrate their differences and similarities are 

 appended. 



Their difference is shown from the observation, (i) that the 

 length of the greater number of the flagella is greatest on the 

 hog cholera and least on the typhoid bacilli, while those of 

 the colon bacteria are of intermediate length ; (2), that the 

 average number of flagella on the colon bacteria is less than 

 that on either of the other species ; and (3), that the terminal 

 and free rings are much more numerous in the preparations of 

 the typhoid bacillus than in those of the other bacteria. This 

 is also true of the incurving flagella. 



Their similarity is illustrated by the fact (i), that the num- 

 bers of flagella on the individual bacteria vary in the different 

 fields in the preparations from the same species as much as in 

 those from different species, excepting in the maximum num- 

 bers ; this is also true of the length of the flagella ; (2), that 

 the diameter of the flagella on the three species is identical ; 

 (3), that the position of the flagella on the body of the germ 

 is the same ; and (4), that fields could be selected in prepara- 

 tions from the three species in which no difference could be 

 detected in the character of the flagella. 



CONCLUSIONS. 



The foregoing examinations and the results of a careful 

 comparative study of the flagella of these three species of 

 bacteria appear to sustain the following conclusions : 



1. These three species of bacteria belong to the Peritricha 

 (Messea"). 



2. There are apparently slight differences in their flagella, 

 but the differences are not marked enough to be deemed of 

 differential value. This is evidenced by the fact that the 

 flagella in different preparations from the same species exhibit 

 quite as marked variations. 



3. There is no difference in the flagella of modified forms of 

 the same species to correspond with the difference in their 

 physiological and etiological manifestations. 



