XII. BACTERIA ONLY KNOWN TO OCCUR IN THE MOUTH

166

170

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XIII. SAPROPHYTIC BACTERIA OF MOUTH NOT DESCRIBED IN PREVIOUS

LIST OF ILLUSTRATIONS.

FIG.

1.-Morphological forms of bacteria

...

2.-Types of spore formation. Types of spore germination. Types

11.- Unglazed porcelain filters (Pasteur Chamberland) 12.-Coverglass jar

...

17.-Bacillus typhi abdominalis, showing flagella
18.-Apparatus for filling tubes with nutrient solutions

PAGE

5

10

:

30.-Filter flask with Pasteur-Chamberland filter ready for filtering

toxine

31.-Widal Blood Pipette

x 1000

33.-Streptococcus pyogenes, twenty-four hours' agar culture
34.-Streptococcus pyogenes, twenty-four hours' agar cultivation
35.-Streptococcus pyogenes, agar culture.
36.-Streptococcus brevis on epithelial cell direct from mouth.
37.-Streptococcus brevis, twenty-four hours' agar culture.
38.-Pipette for collecting pus
39.-Diphtheria bacillus. × 1000 Gram, twenty-four hours' old
40.-Diphtheria bacillus, forty-eight hours' old blood serum. Gram.
x 1000

...

...

...

PAGE

83

x 1000

83

84

87

agar

41.-Bacillus diphtheria cultivation. (Curtis' "Essentials of Practical Bacteriology")

42.-Bacillus tuberculosis, glycerine agar cultivation (Curtis' " Essen-
tials of Practical Bacteriology")...

43.—Bacillus Friedländer gelatin stab (Curtis' "Essentials of Prac-
tical Bacteriology")
44.-Bacillus pyocyaneus, twenty-four hours' agar cultivation.

x 1000 45.—Streptothrix actinomyces cultivation on glycerine agar (Curtis' Essentials of Practical Bacteriology")

66

46.-Dental caries affecting enamel

47.-Dental caries affecting dentine

48.-Streptococcus brevis, agar culture at twenty-four hours.
49.-Streptococcus brevis, broth culture twenty-four hours.
50.-Bacillus mesentericus vulgatus, twenty-four hours' agar culture.
× 1000

...

...

51.-Bacillus subtilis showing spore formation

3

...

52.-Bacillus necrodentalis, forty-eight hours' agar.

...

x 1000

53.—Bacillus plexiformis, gelatin culture, forty-eight hours. x 1000
54. Bacillus plexiformis, twenty-four hours, decalcified dentine.
x 1000

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55.-Yeasts, from Eyre's "Bacteriological Technique " 56. Various forms of mouth bacteria

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57.-Leptothrix racemosa, balsam mount (Dr. Leon Williams). × 1000 186 58.-Leptothrix racemosa, glycerine mount (Dr. Leon Williams). x 1000

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59.-Leptothrix racemosa, "fruitful heads " (Dr. Leon Williams).

60.-Leptothrix racemosa, mouth direct.
61.-Bacillus buccalis maximus, twenty-four hours' agar. x 1000
62.-Spirillum sputugenum (spirilla forms), mouth direct.
63.-Spirillum sputugenum (comma forms), mouth direct.
64.—Spirillum sputugenum freshly isolated, twenty-four hours' agar.

x 1000

x 1000

FIG.

65.-Spirillum sputugenum (comma forms), twenty-four hours' agar.

...

...

...

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x 1000 66.-Spirillum sputugenum (spirilla forms), seven days' broth. × 1000 67.-Streptothrix buccalis, mouth direct.

× 1000

...

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199

202

...

× 600

× 1000

203

204

x 1000

207

x 1000

212

215

217

219

220

221

69.-Streptothrix buccalis, forty-eight hours' agar culture.
69.-Streptothrix buccalis, seven days' potato culture.
70.-Streptothrix buccalis, five days' agar culture
71.-Bacillus coli commune, twenty-four hours' agar.
72.-Vibrio Finkler-Prior, twenty-four hours' broth.
73.-Compound bacteriological microscope (Watson's)
74.—Fine adjustment of microscope (Watson's)
75.-Characters of gelatin stab cultivations (Eyre, after Chester)
76.-Characters of gelatin stab cultivations (Eyre, after Chester)
77.-Types of colonies (Eyre, after Chester)

78.-Types of colonies (Eyre, after Chester) 79.-Detailed character of surface of stab cultures (Eyre, after Chester) 222 80.-Structure of colonies (Eyre, after Chester) 81.--Structure of colonies (Eyre, after Chester) 82.—Edge of colonies (Eyre, after Chester)