ORGANIZATION OF THE BACTERIA. 39 
the purple coloring matter of other alge, 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 
Trécul. These organisms are, according to Van 
Tieghem, 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 Cohnu, 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 Dal- 
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. robustum, and Vibrio rugula. 
