er confervoid algae.
Although this has by no means been proved, yet I cannot help calling the
attention of the members of this society to a fact which I think strongly
bears out the said theory: While watching a gathering of _Vaucheria_ one
morning when the plant was in the gonidia-forming condition (which is
usually assumed a few hours after daybreak), I observed one filament, near
the end of which a septum had formed precisely as in the case of ordinary
filaments about to develop a spore. But, instead of the terminal cell being
filled with the usual densely crowded cluster of dark green granules
constituting the rapidly forming spore, it contained hundreds of actively
moving, nearly transparent zoospores, _and nothing else_. Not a single
chlorophyl granule was to be seen. It is also to be noted as a significant
fact, that the cellulose wall was _intact_ at the apex, instead of showing
the opening through which in ordinary cases the gonidium escapes. It would
seem to be a reasonable inference, I think, based upon the theory above
stated, that in this case the newly formed gonidium, unable to escape from
its prison by reason of the abnormal strength of the cell wall, became
after a while resolved into its component zoospores.

WONDERS OF REPRODUCTION.

I very much regret that my descriptive powers are not equal to conveying a
sufficient idea of the intensely absorbing interest possessed by this
wonderful process of spore formation. I shall never forget the bright sunny
morning when for the first time I witnessed the entire process under the
microscope, and for over four hours scarcely moved my eyes from the tube.
To a thoughtful observer I doubt if there is anything in the whole range of
microscopy to exceed this phenomenon in point of startling interest. No
wonder that its first observer published his researches under the caption
of "The Plant at the Moment of becoming an Animal."

FORMATION OF OTHER SPORES.

The process of spore formation just described, it will be seen, is entirely
non-sexual, being simply a vegetative process, analogous to the budding of
higher plants, and the fission of some of the lower plants and animals.
_Vaucheria_ has, however, a second and far higher mode of reproduction,
viz., by means of fertilized cells, the true oospores, which, lying dormant
as resting spores during the winter, are endowed with new life by the
rejuvenating influences of spring. Their formation may be briefly descri