72 Geological Society: — 



meter, bright on both sides, working by the action of warm water 

 below and the cooling effect of the air above. 



17. Radiometer. — A four-armed, metallic radiometer with deep 

 cups, bright on both sides. 



18. Radiometer. — A four-armed radiometer, the vanes consisting 

 of mica cups, bright on both sides. 



19. Radiometer. — A four-armed radiometer having clear mica 

 vanes, the direction of motion being determined by the angle formed 

 by the mica vanes with the inner surface of the glass bulb. 



GEOLOGICAL SOCIETY. 

 [Continued from vol. iv. p. 312.] 



November 21, 1877.— John Evans, Esq., F.E.S., D.C.L., Vice- 

 President, in the Chair. 



The following communications were read : — 



1. " On the Glacial deposits of West Cheshire, together with lists 

 of the fauna found in the Drift of Cheshire and adjoining Counties." 

 By W. Shone, Esq., F.G.S. 



The conclusions arrived at by the author in this paper were as 

 follows. Like Prof. Hull, he distinguished a triple division of the 

 deposits under consideration. 1. The Lower Boulder-clay, or, as he 

 preferred to call it, Lower Glacial Drift, resting immediately upon 

 the eroded surface of the Keuper, consists for the most part of com- 

 pact clay, containing numerous and large striated erratics, together 

 with a fauna of Scandinavian type, the Gasteropoda being generally 

 filled with fine silt containing Microzoa. The author believed that 

 the shells found in this deposit were principally distributed by ground- 

 ice, which took them up and floated them off the shore. 2. The 

 Middle Sands and Gravels, or Interglacial Drift of the author, con- 

 sist chiefly of sands and gravels containing few (if any) glaciated 

 stones. The fauna of this division is Celtic, with a few Scandina- 

 vian species derived from the Lower Boulder-clay ; the shells were 

 distributed principally by currents; and the Gasteropoda were seldom, 

 if ever, filled with sand containing Microzoa. 3. The Upper Boulder- 

 clay, or Upper Glacial Drift, is composed for the most part of clay 

 not so compact as the Lower Boulder-clay, and containing fewer and 

 smaller glaciated stones, which are more abundant near the base. 

 The fauna is Scandinavian at the base of the beds. The shells were 

 distributed principally by ground-ice, and those of southern type 

 derived from the Middle Sands and Gravels. The Gasteropoda are 

 chiefly filled with silt containing Microzoa. The paper was accom- 

 panied by lists and tables of fossils, a large collection of which was 

 exhibited in illustration of the paper. 



[The Chair was then taken by Warington Smyth, Esq., M.A., 

 E.E.S., F.G.S.] 



2. " The Moffat Series." By C. Lapworth, Esq., E.G.S. 



The fossils found in the highly convoluted Lower Silurian rocks 

 of the southern uplands of Scotland are usually restricted to certain 



