thickness. 2, Smaller spore with verruculous covering. 3, Spore with
punctulated covering. 4, The same. 5, Minute spores with blue-greenish
colored contents, 0.0021 millimeter in diameter. 6, Larger form of 5. 7,
Transparent spherical spore, contents distinctly refracting the light,
0.022 millimeter in diameter. 8, Chroococcoid minute cells, with
transparent, colorless covering, 0.0041 millimeter in diameter. 9,
Biciliated zoospore. 10, Plant of the Gemiasma rubra, thallus on both
ends attenuated, composed of seven cells of unequal size. 11, Another
complete plant of rectangular shape composed of regularly attached
cells. 12, Another complete, irregularly shaped and arranged plant. 13,
Another plant, one end with incrassated and regularly arranged cells.
14, Another elliptical shaped plant, the covering on one end attenuated
into a long appendix. 15, Three celled plant. 16, Five celled plant.
10-16 magnified 440/1.]

I wish to conclude this paper by alluding to some published
investigations into the cause of ague, which are interesting, and which
I welcome and am thankful for, because all I ask is investigations--not
words without investigations.

The first the Bartlett following:

Dr. John Bartlett is a gentleman of Chicago, of good standing in the
profession. In January, 1874, he published in the _Chicago Medical
Journal_ a paper on a marsh plant from the Mississippi ague bottoms,
supposed to be kindred to the Gemiasmas. In a consideration of its
genetic relations to malarious disease, he states that at Keokuk, Iowa,
in 1871, near the great ague bottoms of the Mississippi, with Dr. J. P.
Safford, he procured a sod containing plants that were as large as rape
seeds. He sent specimens of the plants to distinguished botanists, among