Duhlin Microscopical Gluh. 141 



Gelatine Jelly simulating the ^'•canal-system^' of Eozoon canadense. 

 — Prof. SoUas showed a thin slice of gelatine jelly containing 

 groups of canals which curiously simulated in form, dimensions, 

 and arrangement the canal-system of Eozoon canadense. They were 

 obtained by sliciag jelly frozen in Rutherford's microtome, and 

 were no doubt caused by the crystallization of the water contained 

 in the jelly into spicules of ice, which, afterwards thawing, left the 

 canalicular spaces exhibited. 



Parasitic Structure on Moss-leaves. — Mr. Archer showed leaves of a 

 moss, which he owed to Mr. E. Parfitt of Exeter, bearing examples of 

 what appeared to be either a form of adventitious bud or a true 

 parasite growing on the edges and elsewhere from one of the leaf-cells. 

 This growth formed a short, stout, cylindrical " filament," thick- 

 walled and divided by four or five transverse septa, not obliquely 

 sloped, as in protonematous growths. The cells, thus much shorter 

 than broad, so formed were densely filled with coarse and scattered 

 chlorophyll granules. Thus their growth pi'esented at first glance 

 a resemblance to some parasitic stigonematous algal form ; but be 

 it parasite or not, it certainly seemed that it could not be of that 

 nature. It really seemed to be initiated by an outgrowth from one 

 of the constituent cells of the leaf, and then the short stout fila- 

 ment, as described, formed by further transverse division ; but its 

 nature or purport remained a question, 



Structure of Stem of Draccena reftexa, — Prof. M'Nab showed a 

 transverse section of the stem of Draccena rejiexa, showing circum- 

 ferential growth by means of a meristem layer, which is to be 

 regarded probably as the homologue of the interfascicular cambium of 

 the dicotyledon, and that while the cambium of the dicotyledon 

 gives rise to new wood, new bast, and new ground-tissue (medullary 

 raj's), the meristem gives rise in the tree Liliaceae to the libero- 

 ligneous bundles and ground-tissue. 



May 15, 1884. 



Peziza postuma from Potato-stalks. — Mr. Greenwood Pim showed 

 Peziza postuma (Berk, et Wilson) growing from the sclerotia of 

 potato-stalks, and which corresponded to the figures by Mr. Wilson 

 in the ' Gardeners' Chronicle.' The whole plant in situ was exhi- 

 bited, as well as a section under the microscope, showing sporidia 

 &c. Mr. Pim had shown sections of the sclerotium to the Club a 

 couple of years previously. The fully-developed Peziza from fruit 

 was observed by Mr. Wilson in 1883. Mr. Pim's specimens were 

 grown in damp Sphagnum in his greenhouse. He was indebted 

 for the sclerotia to the kindness of Mr. Carroll, of the Model Farm, 

 Glasnevin, who had received large quantities from various parts of 

 Ireland, where last year it proved a formidable form of disease, quite 

 distinct, of course, from the ordinary potato-murrain. 



Ann. (k Mag. K Hist. Ser. 5. Fo?. xvi. 11 



