20 



MICROSCOPICAL AND NATURAL HISTORY SECTION. 



December Stli, 1884. 



Thomas Alcock, M.D., President of the Section, 

 in the Chair. 



Professor A. Milnes Marshall, M.D, D.Sc, of Owens 

 College, read a paper on the morphology of the sexual organs 

 of Hydra. He also exhibited some specimens showing the 

 regeneration of the visceral mass in Comatula, and likewise 

 some specimens of Pennatula. Professor Marshall promised 

 to make some further communications to the Section on the 

 subject at an early date. 



Mr. Hyde exhibited to the Section (1) a piece of chalk 

 from Brighton, perforated by Pholades ; (2) some stalactites 

 from Victoria Cave, Settle ; and (3) a piece of Fluor Spar, 

 from the Blue John Mine, Derbyshire. 



Mr. K D. Darbishire, exhibited some fine specimens of 

 Magilus Antiquus, and some remarkable series of various 

 forms of Leptoconchus from the Mauritius. 



Mr. A. Brothers, F.H.A.S., exhibited (under the micro- 

 scope) the electric spark, as produced by a Carbonate of 

 Potash Battery, at the extremities of two lead pencil points. 

 An induction coil being used in the process. 



" On the Caernarvonshire Station of Rosa Wilsoni, 

 Borrer," by Charles Bailey, F.L.S. 



I exhibit, to-night, fruiting specimens of Rosa Wilsoni, 

 Borrer, collected on the first of October last from plants 

 growing in tlie original station on the Caernarvonshire side 

 of the Menai Straits. In former years I had frequently 



