Page 105 - My FlipBook

tained this same coccus twice—once from my own mouth
and once from one of the class. I want to call your atten-
tion to a tube of agar-agar on which I planted this Staphy-
lococcus Pyogenes Albus. It isn't quite pure ; it seems to
be a mixture of Albus and Aureus, for you will get a tinge
of yellow color in it. (Passes tubes to class.)
Now I have a number of tubes that have been planted
at different times with various organisms. Several of
Staphylococcus Pyogenes Albus are marked ''liquefying."
Three of the same coccus are planted upon agar-agar. Note
particularly that it does not liquefy the agar-agar, however.
It is the same plant that is liquefying the gelatin. Here is a
tube planted from the saliva that has got some mold acci-
dentally. Here is another with a spot of young mold just
started growing; it has no hyphea yet; it is not seeding.
You see only the mycilium.
I would like to say a word or two about the Staphylococ-
cus Pyogenes Albus while these are being passed, repeat-
ing, perhaps, some things I said in my last lecture. It is the
organism we most often find in the mouth producing pus.
I find it in the mouth very frequently; indeed, I think we
will generally find it in the mouth if we make a thorough
search, although it is not reckoned as one of the micro-
organisms whose natural habitat is the mouth. It is the
micro-organism we find in abscesses more often than any
other ; indeed, we will find it in a very large proportion of
the abscesses that we get in the infirmary if we plant from
the pus. It is very rare that we find in abscesses in the
mouth the Streptococcus Pyogenes ; I have only found it a
few times in abscesses in the mouth and have not seen it in
the plants this year. The Staphylococcus Pyogenes Albus
will not produce abscesses unless there is a tissue injury to
begin with which causes some inflammation. The system
may be infected with this micro-organism, and if the person
is otherwise in a fair state of health no abscess will be pro-
duced, no pus formation will occur and the organisms will
be eliminated within a few days and pass away and the sys-
tem will become entirely free from them again. But if there
is a weak point, a point where the tissues are not doing well,
where there is a lowering of the vitality, then these micro-
organisms will take hold and inflammation may occur — pus

53