ORGANIZATION OF THE BACTERIA. 39 



the purple coloring matter of other algae, as that 

 of the Porphyridium cruentum, which comes from 

 a mixture of chlorophyll and of phycoerythrine. 

 The bacteria never contain chlorophyll. 



In this connection, it is interesting to recall the 

 protoplasmic constitution of the Amylobacter of 

 Trecul. These organisms are, according to Yan 

 Tieghern, bacteria, to which he has given the name 

 of Bacillus Amylobacter, and which does not dif- 

 fer from B. subtilis, except by a specific character, 

 extremely transitory, the presence of amorphous 

 starch, formed and stored in reserve during the 

 period of growth, to be again used later, and con- 

 sumed during the process of reproduction. 



Cilia. These appendages which were described 

 by Ehrenberg in the Bacterium trilocular have 

 not been seen since. To-day, recent researches 

 permit us to say that cilia exist without doubt in 

 all the true bacteria, Bacillus, Bacterium, Spi- 

 rillum. They have been perceived in a great 

 number of forms, Spirillum volutans, Sp. undula, 

 Vibrio rugula, Spiromonas Cohnii, Vibrio ser- 

 pens, and several species of Bacillus. It is only 

 in the smallest of the bacteria that it has hitherto 

 been impossible to demonstrate their presence. 

 They have, however, been recently seen by Dai- 

 linger and Drysdale in Bacterium termo. Warm- 

 ing has perceived as many as two or three on one 

 extremity in Ophidomonas sanguinea Spirillum 

 volutans var. robuslum, arid Vibrio rugula. 



