ridium 75
Cienkowskia 75
Leocarpus 76
Physarella 78
Cytidium 80
Craterium 84
Physarum 88
Fuligo 102
Badhamia 105
Scyphium 109

List or Illustrations

Vol. XV. Plate III. Figs. 1-12.
Vol. XVI. Plate I. Figs. 13-24.
Vol. XVI. Plate XI. Figs. 25-36.
Vol. XVI. Plate XII. Figs. 37-48.
Vol. XIX. Plate XIII. Figs. 49-55.
Vol. XIX. Plate XIV. Figs. 56-63.
Vol. XIX. Plate XV. Figs. 64-73.

PRESTON, HAMILTON COUNTY, OHIO, December 28, 1892.

MR. DAVIS L. JAMES

_Dear Sir_--Along with this I send you the first installment of the
papers, entitled "The Myxomycetes of the Miami Valley, Ohio."

The work in these papers is based upon my ample collection of
Myxomycetes growing in this region, comprising more than one hundred
species; these have been diligently compared with specimens obtained
from correspondents elsewhere in this country and in Europe.

At the same time, I have also included many extra limital species. This
has been done chiefly to more clearly elucidate the subject in places
where the local material is not sufficient.

The only apology I can make for the arrangement which I present, is that
I have been obliged to choose from several different systems. I have
aimed not to hamper myself, by attaching paramount importance to some
particular character throughout.

I purpose to furnish a synopsis of the whole at the end of the work.

Very truly yours,
A. P. MORGAN.

* * * * *

MYXOMYCETES, Wallr.

Fructification essentially a minute membranaceous vesicle, the
SPORANGIUM inclosing the SPORES, the product of a motile protoplasmic
body called the PLASMODIUM.

Microscopic organisms with the habit of the Fungi. The ripe spore of the
Myxomycetes is globose or ellipsoidal in shape, with the epispore
colorless or colored, and smooth or marked by characteristic
surface--sculpture according to the species; the spore in germination
gives rise to an elongated protoplasmic body, which exhibits amoeboid
movements, and is known by the name of _swarm-cell_. The swarm-cells
multiply by bipartition, which may be repeated through several
generations; they then unite together to form the