_C. laxa_, as the name implies, shows an open construction, suggested, perhaps, by Rostafinski's photographic print, but better brought out by Celakowsky, _Myx. Boehm._, Tab. 2, Figs. 7 and 8. e. It has been shown[40] that the process of cell-division in the spore-plasm of the myxomycete is not dissimilar to that obtaining under the same conditions in higher plants. On this supposition we have explanation of spore-division in _Ceratiomyxa_ and can understand the adherence of spores now and again notable. Once the latter phenomenon was thought peculiar to the genus _Badhamia_; but the unsculptured epispore of the spores of reticularias, tubiferas, etc., suggest the same thing and more recently we find it in _Dianema_ and in the _Stemoniteae_; even _Stemonitis_ arrives with clustered spores in groups of four, and we are in sight of a generalization wide. It is interesting to note that something of this sort was observed by at 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.