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PATHOGENIC BACTERIA OF THE HUMAN MOUTH. 2 '3 5
teria really occur in the saliva of hea'thy jersms as often as
Black's observations would lead lis to suppose.
d. Micrococcus tetrcigenvs.
This micro-organism has been repeatedly mentioned as an in-
mate of the oral cavity. I myself have found it quite often, but
unfortunately took no notes concerning its frequency. Biondi
found it three times out of five.
It occurs in the form of cocci, about lix in diameter, which
by lissation in two directions form groups of fours (Fig. 113).
The cells are inclosed and held together by a gela-
tinous disk. F^«- ^13.
It grows on gelatine-plates, without liquefying
''t*~
the o;elatine, in the shape of small, white, dot-like ' ..**"
colonies, which, under weak power, appear finely .," p si
granular and have a peculiar glass-like brilliancy Micrococcus
(Eisenberg).
600:i.
White mice and guinea-pigs inoculated with
Micrococcus tetragenus perish in from three to ten days. Ac-
cording to Biondi, even the injection of saliva which contains
this microbe proves fatal in four to eight days. The cocci are
found in the blood as well as in all organs.
Micrococcus tetragenus was first found by Koch^^^ and
Gaffky ^^ in the lungs of a consumptive. It frequently occurs
in lung-tuberculosis, but the part it plays in this disease has not
yet been ascertained (Fliigge).
BiONDi's Mouth-Bacteria.
A valuable contribution to our knowledge of pathogenic bac-
teria of the mouth has been furnished by Biondi.^^^ He isolated
from human saliva five different pathogenic micro-organisms, to
which he g^ave the followins; names
Bacillus salivarius septicus.
Coccus salivarius septicus.
Micrococcus tetragenus (mentioned above).
Streptococcus septo-pysemicus.
Staphylococcus salivarius pyogenes.
PATHOGENIC BACTERIA OF THE HUMAN MOUTH. 2 '3 5
teria really occur in the saliva of hea'thy jersms as often as
Black's observations would lead lis to suppose.
d. Micrococcus tetrcigenvs.
This micro-organism has been repeatedly mentioned as an in-
mate of the oral cavity. I myself have found it quite often, but
unfortunately took no notes concerning its frequency. Biondi
found it three times out of five.
It occurs in the form of cocci, about lix in diameter, which
by lissation in two directions form groups of fours (Fig. 113).
The cells are inclosed and held together by a gela-
tinous disk. F^«- ^13.
It grows on gelatine-plates, without liquefying
''t*~
the o;elatine, in the shape of small, white, dot-like ' ..**"
colonies, which, under weak power, appear finely .," p si
granular and have a peculiar glass-like brilliancy Micrococcus
(Eisenberg).
600:i.
White mice and guinea-pigs inoculated with
Micrococcus tetragenus perish in from three to ten days. Ac-
cording to Biondi, even the injection of saliva which contains
this microbe proves fatal in four to eight days. The cocci are
found in the blood as well as in all organs.
Micrococcus tetragenus was first found by Koch^^^ and
Gaffky ^^ in the lungs of a consumptive. It frequently occurs
in lung-tuberculosis, but the part it plays in this disease has not
yet been ascertained (Fliigge).
BiONDi's Mouth-Bacteria.
A valuable contribution to our knowledge of pathogenic bac-
teria of the mouth has been furnished by Biondi.^^^ He isolated
from human saliva five different pathogenic micro-organisms, to
which he g^ave the followins; names
Bacillus salivarius septicus.
Coccus salivarius septicus.
Micrococcus tetragenus (mentioned above).
Streptococcus septo-pysemicus.
Staphylococcus salivarius pyogenes.
