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mouth and feeling badly all over; he wanted to know what
was the matter with his mouth. I found the whole mucous
membrane white, and the white material had worked out
onto the Hps. I took some of the material to the field of
the microscope and that is what I found. I cultivated it and
fotmd that it was a bacillus, multiplying by division, but very
large. I went to work vigorously with antiseptics and in
two or three days he was well, and I could not find a speci-
men in the mouth. I have never met with a specimen of it
since.
(Changing slides. Fig. 15.) This is from a pen picture
of a micro-organism we cannot photograph—the jodococcus
vaginatus. It is a micro-organism that is abundant in the
human mouth. We cannot see it with the microscope be-
cause it is so perfectly transparent. It will not stain by any
\ of the usual methods. It will not take any of the aniline
;0l dyes at all. It will stain slightly with iodine, but it does not
.
stain sufficiently for us to photograph it. So far as we can
find, it does no harm. We cannot cultivate it at all. Dr.
Miller thinks he did get a little growth once— i. e., he got
enough growth to make just a little bit of color with iodine.
(The picture is not drawn to scale. The organism is very
small.)
(Changing slides, Fig. 16.) The spirochaetes that we
find abundant in the mouth. These we cannot cultivate ;.
they will not grow out of the saliva. They will live on a
gl^ss slide for a number of hours. They are motile, and
very rapidly motile, so that when you first place them on
the slide the whole thing will be in a tremor, but if you seal
down the cover glass and let them rest for some hours you
I will find the motions will become slower and slower, until
you will be able to get a good view of their motion. You
will find it is a corkscrew motion, going first forward and
then backward continually. They keep up that motion ap-
parently as long as they live. We will find them about the
necks of teeth in almost every mouth. (This picture is also
from a pen drawing, which is not drawn to scale. The organ-
isms are very small.)

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