Dr. Cutter writes me September 28, 1882: "My dear Professor: By this
mail I send you a specimen of the Gemiasma rubra of Salisbury, described
in 1862, as found in bogs, mud holes, and marshes of ague districts, in
the air suspended at night, in the sputa, blood, and urine, and on
the skin of persons suffering with ague. It is regarded as one of the
Palmellaceae. This rubra is found in the more malignant and fatal types
of the disease. I have found it in all the habitats described by Dr.
Salisbury. Both he and myself would like you to examine and hear what
you have to say about it."
The substance of clayish soil contains, besides fragments of shells of
larger diatoms (Suriella synhedra), shells of Navicula minutissima,
Pinnularia viridis. Spores belonging to various cryptogams.
1. Spherical transparent spores with laminated covering and dark
nucleus--0.022 millimeter in diameter.
2. Spherical spores with thick covering of granulated surface.
3. Spherical spores with punctulated surface--0.007 millimeter in
diameter.
4. Very minute, transparent, bluish-greenish colored spores, with thin
covering and finely granulated contents--0.
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