I have no difficulty in accounting for the presence
of the Gemiasmas in the Croton, as during the last summer I made studies
of the Gemiasma at Washington Heights, near 165th St. and 10th Ave.,
N.Y.
Plate VIII. is a photograph of a drawing of some of the Gemiasmas
projected by the sun on the wall and sketched by the artist on the wall,
putting the details in from microscopical specimens, viewed in the
ordinary way. This should make the subject of another observation.
I visited this locality several times during August and October, 1881. I
found an abundance of the saline incrustation of which you have spoken,
and at the time of my first visit there was a little pond hole just east
of the point named that was in the act of drying up. Finally it dried
completely up, and then the saline and green incrustations both were
abundant enough. The only species, however, I found of the ague plants
was the Gemiasma verdans. On two occasions of a visit with my pupils I
demonstrated the presence of the plants in the nasal excretions from my
nostrils. I had been sneezing somewhat.
There is one circumstance I would like to mention here: that was, that
when, for convenience' sake, my visits were made late in the day, I
did not find the plants abundant, still could always get enough to
demonstrate their presence; but when my visits were timed so as to come
in the early morning, when the dew was on, there was no difficulty
whatever in finding multitudes of beautiful and well developed plants.
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