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clear; couldn't see the greenish tinge in the test tube; put
some of that upon a microscope slide and examined it, and
we found the water was filled with minute bodies, running
hither and yon with great rapidity—a minute form of Algea
with its ciliae, apparently very busy; not an animal, but a
plant. Another form that we frequently find is the Euglena.
That we are liable to find after a rain, springing up in a horse
track or any little depression where a Httle water has col-
lected; it becomes green within a few hours, and if we dip
down into it we find the whole body of that little pool of
water is green ; no form that we can see with the naked eye,
and yet, if we place it under a microscopic lens we find lit-
tle elongated forms that are turning and twisting, moving
slowly about among each other ; no animals, but plants that
have this power of motion, this power of going about from
one place to another. They are microscopic in size, but
they are not micro-organisms. Of this order of plants there
are many species.
The Fungi have none of this coloring matter ; they grow
in the dark as well as in the light; their bodies are usaally
white, yet some of them have more or less of color ; it may
be a yellow, it may be a brown, or other color. Now and
then, however, I have seen some Fungi that had a strong
contrast of color upon the upper surface, the lower being
white—fungi that were growing freely in the air.
The Hyphomycetes are the highest form. These are
formed of threads and are famiHar as toadstools, mushrooms,
house molds and many of the forms of molds that are para-
sitic on plants. They are formed of a thread made up of cells
placed end to end. (Referring to blackboard.) Now, that
looks very much like the picture certain forms of micro-
organisms woiild make, but are very much larger. These
threads grow and lengthen and divide. If a spore of a
house mold is planted under conditions for observation one
will find growing out from it a delicate network in every di-
rection, until the medium in which they grow, if it is soft, is
filled with them ; or it may be creeping over the surface of a

stone or a damp wall, where there is a little bit of nutrition
for them ; or if they grow in fluid this will be a ball or span-
gle of delicate threads. If they grow upon some medium in
which this can ramify they will soon put up little filaments

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