Roman experiments, and as he does not offer anything positive as a
cause of ague, I can only express the hope that he will continue his
investigations with zeal and earnestness, and that he will produce
something positive and tangible in his labors in so interesting and
important a field.

I would then that all would join hands in settling the cause of this
disease; and while I do not expect that all will agree with me, still, I
shall respect others' opinions, and so long as I keep close to my facts
I shall hope my views, based on my facts, will not be treated with
disrespect.


APPENDIX.

Gemiasma verdans and Gemiasma rubra collected Sept. 10, 1882, on
Washington Heights, near High Bridge. The illustrations show the manner
in which the mature plants discharge their contents.

Plate VIII. A, B, and C represent very large plants of the Gemiasma
verdans. A represents a mature plant. B represents the same plant,
discharging its spores and spermatia through a small opening in the cell
walls. The discharge is quite rapid but not continuous, being spasmodic,
as if caused by intermittent contractions in the cell walls. The
discharge begins suddenly and with considerable force--a sort of
explosion which projects a portion of the contents rapidly and to quite
a little distance. This goes on for a few seconds, and then the cell is
at rest for a few seconds, when the contractions and explosions begin
again and go on as before. Under ordinary conditions it takes a plant
from half an hour to an hour to deliver itself. It is about two-thirds