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we do not get the whole field in focus. Now you will see
that this is somewhat smaller than the other streptococci.
These always divide upon one pole, forming primarily
straight chains of cells.
(Changing slides.) Here is another picture of the caries
fungus in which the chains appear shorter. Occasionally
we find caries fungi growing twenty or thirty together, but
they generally break up in four, six or eight, or into com-
paratively short chains. Here is one of four ; here is one of
six ; here is one of six, and here is one of four. They elon-
gate, then, on one pole and always divide across that pole so
that they form into these straight or slightly curved chains.
(Changing slide.) Here is another picture of caries
fungus. Here is a bunch that is not at all clear. In examin-
ing micro-organisms with the microscope you will often find
those bunches where they are not sufficiently distributed
on the glass in which you will not be able to distinguish
any outline at all. That is a very fair illustration of it.
But some portions of the field are better. These chains of
cells is the general form of all of the micro-organisms known
as the streptococci ; it is the growth form. When the growth
becomes old the organisms will fall apart and you will find
only round cells. They will be like the staphylococcus, but
by mounting them while they are growing we get their
growth forms.
(Changing slides.) This is mostly caries fungus, but
here is a thread of another species which I would recognize
at once, and yet, it is so nearly like the other that it would
require considerable experience to recognize that it is a dif-
ferent species by the form. And you see here (pointing out),
these are just about ready to divide again—each cell of the
chain dividing again. You see in that way they grow
throughout the length of the filament. They are held to-
gether by a sheath, and that form—the streptococcus cort-
tinuosum, will form threads of interminable length,
(Changing slides, Fig. 6.) We have it here, pure and,
you see, unbroken chains of cells. I have searched over that
slide many a time to find an end to one of those chains
searched an hour, perhaps, and not be able to find an end.
This is one of the very difficult micro-organisms to cultivate,
and yet I find it in almost every mouth; indeed, I believe I
63
we do not get the whole field in focus. Now you will see
that this is somewhat smaller than the other streptococci.
These always divide upon one pole, forming primarily
straight chains of cells.
(Changing slides.) Here is another picture of the caries
fungus in which the chains appear shorter. Occasionally
we find caries fungi growing twenty or thirty together, but
they generally break up in four, six or eight, or into com-
paratively short chains. Here is one of four ; here is one of
six ; here is one of six, and here is one of four. They elon-
gate, then, on one pole and always divide across that pole so
that they form into these straight or slightly curved chains.
(Changing slide.) Here is another picture of caries
fungus. Here is a bunch that is not at all clear. In examin-
ing micro-organisms with the microscope you will often find
those bunches where they are not sufficiently distributed
on the glass in which you will not be able to distinguish
any outline at all. That is a very fair illustration of it.
But some portions of the field are better. These chains of
cells is the general form of all of the micro-organisms known
as the streptococci ; it is the growth form. When the growth
becomes old the organisms will fall apart and you will find
only round cells. They will be like the staphylococcus, but
by mounting them while they are growing we get their
growth forms.
(Changing slides.) This is mostly caries fungus, but
here is a thread of another species which I would recognize
at once, and yet, it is so nearly like the other that it would
require considerable experience to recognize that it is a dif-
ferent species by the form. And you see here (pointing out),
these are just about ready to divide again—each cell of the
chain dividing again. You see in that way they grow
throughout the length of the filament. They are held to-
gether by a sheath, and that form—the streptococcus cort-
tinuosum, will form threads of interminable length,
(Changing slides, Fig. 6.) We have it here, pure and,
you see, unbroken chains of cells. I have searched over that
slide many a time to find an end to one of those chains
searched an hour, perhaps, and not be able to find an end.
This is one of the very difficult micro-organisms to cultivate,
and yet I find it in almost every mouth; indeed, I believe I
63
