207 
Ordinary Meeting, March 23rd, 1886, 
Professor W. C. Williamson, LL.D., F.KS., President, 
in the Chair. 
The President invited Professor E, Graf Von Solms, of 
Gottingen, who was present, to give a brief account of some 
recent discoveries of Fossil Plants on the Continent, under 
conditions almost identical with those under which similar 
ones are met with at Oldham, Halifax and other neigh- 
bouring localities. The latter objects are obtained from 
calcareous nodules embedded in some of the very thin and 
lowest coals of the Lancashire and Yorkshire series above 
the millstone grit, but immediately below the Ganister rock, 
with its marine molluscous Aviculo-pectens and Goniatites. 
Thin coals of the same age containing similar nodules, and 
also overlaid by a Ganister zone containing the same marine 
shells, have been discovered at Pith Vollmond near Langen- 
dreer in Westphalia; and these nodules abound in fragments 
of Lepidodenon Selaginoides, Lyginodendron Oldhamium, 
and other plants characteristic of the Lancashire and 
Yorkshire nodules. Similar nodules, containing the same 
plants, have been obtained by Professor Sturr of Vienna, in 
the Banat in South Hungary and at another locality in 
Moravia. At both these places also a bed containing 
Aviculo-pecten papyraceus overlaid the coals. 
“On the Efflux of Air as modified by the Form of the 
discharging Orifice,” by Henry Wilde, Esq. 
In my former paper on the efflux of air, the hydraulic 
coefficient *62, as commonly applied to the discharge of 
