Page 111 - My FlipBook

BIOLOGICAL STUDIES ON THE BACTERIA OF THE MOUTH. 85

Up to 1885, 1 had isolated twenty-two different kinds of bacteria
from the human mouth. A number of these are represented in
Figs. 33 to 44. In these figures b represents the form of the re-
spective colonies, on 10 per cent, gelatine, slightly magnified.
Ten of the twenty-two kinds mentioned appear in the form
of cocci ; four of these are reproduced in Figs. 33-36 : they are
of different dimensions, from very small, round cells (Fig. 33)
to remarkably large cocci, " macrococci" (Fig. 36).

Fig. 33. Fig. 34. Fig. 35 Fig. 36.

• • •

Flo. 37. Fig. 38. Fig. 39.

Fig. 40. Fig. 41. Fig. 42

•
't'-

Five appeared as short rods (Figs. 37, 38), six as somewhat
longer rods (Figs. 39, 40). A curved species, which liquefied
gelatine and produced a green coloring-matter, was designated
by the name Vibrio riridans (Fig. 41). One species (Fig. 42)
formed spirilla, another developed into long threads (Fig. 43).
One again formed long jointed threads, some of which were fur-
nished with sheaths (Fig. 44). Of thirty species cultivated later,
eighteen were cocci, eleven rods, while one grew into threads.
In liquids three developed into rather long articulated or in-