least one student long ago. Schumacher, _Enum. Pl. Sell._ 2, p. 215,
describes _Arcyria atra_ with the characters of an enerthenema, and says
"the capillitial threads are some of them diffuse and bear spermatic
globules"! Did he anticipate _E. berkleyanum_? See the text under that
species at p. 190, _supra_.

f. In a paper read December, 1920, before the _Mycological_ Division of
Section G., _A. A. A. S._, the present writer discussed briefly the
physical principles involved in some of the more striking peculiarities
of the slime-moulds.

It is argued in that paper that the shaping of stipitate sporangia which
is so surprising as relating to the ordinary behaviour of fluid masses,
as usually observed, is, in part at least, referable to certain well
known properties of fluids generally. For this discussion those
interested are referred to the article itself in the November number of
_Mycologia_ (N. Y.).

Sufficient to say here that it is a fact, in many cases, that in
stipitate fructification, so far as observed, the stipe is first to take
form, and, as viewed by the writer, in many cases, as it rises, becomes
more and more a most delicate but definite ectosarcate capillary tubule,
by which ascends the spore-plasm of the point concerned, to such level
as may meet the immediate conditions of pressure, of whatsoever source.

It will be interesting in this view to note the resultant shapes as
presented in the sporangia of various genera. One may examine for
illustrations Figs. 1, 3, 4, 7, Pl. XX., with the thought in mind that
the stipe in each case may have served as a capillary tubule to carry up
the spore-plasm to the position in which the spores at length are found.
In some species of _Hemitrichia_, for instance, there are spores or
spore-like cells found at maturity in the hollow stipe. In other cases
the stipe contains refuse matter.

The capillary theory may not, probably does not, play part in every
case. It would seem that a stemonitis, for example, must owe the rise of
the spore-plasm to the play of different machinery. _Brefeldia_, p. 154
above, may offer suggestion.

g. On page two of the introductory section of this volume mention is
made of the variety of colors shown in the vegetative phases of the
organisms we study. This fact is patent to all observers; but the
identity of the plasmodium making the display must be ascertained by
painstaking or prolonged and repeated observations. This for the reason