11 CONTENTS. 



Pishes— Extraordinary Development of the Cuta- 

 neous System — Heterocercal Tail of the Old Red 

 Sandstone Fishes — Embryonic Age of the Reign of 

 Fishes — Cephalaspides — Dipterians — Acanthodi- 

 ans — Celacanthes — Placoides — Serial Classifications 

 to be renounced — Great Diversity of Species in the 

 Devonian System, . . . . 17 



III. On the Classification of Birds, and particularly of the 



Genera of European Birds. By John Hogg, 

 Esq., M.A., F.R.S., F.L.S., &c. Communi- 

 cated by the Author, 50 



IV. Marine Deposits on the margin of Loch Lomond. 



By the Rev, J. Adamson, . . . .72 



V. Address delivered at the Anniversary Meeting of the 

 Geological Society of London, on 20th February 

 1846. By Leonard Horner, Esq., V.P.R.S., 

 President of the Society : — 



Geology of Russia — Silurian Rocks — Devonian Rocks 

 — The Carboniferous Series — Theories of the For- . 

 mation of Coal — Permian System — Secondary Rocks 

 — Cretaceous Rocks — Tertiary Deposits — Metamor- 

 phic Rocks, . . . . . 75 



VI. On the Surface of the Moon. By Captain Rozet, . 128 



VII. Observations on the Principle of Vital Affinity, as il- 



lustrated by recent discoveries in Organic Che- 

 mistry. By William Pulteney Alison, M.D., 

 F.R.S.E., Professor of the Practice of Medicine 

 in the University of Edinburgh, &c., . 132 



VIII. On the Constitution and Properties of Picoline, a new 

 Organic Base from Coal-Tar. By Thomas An- 

 derson, M.D., F.R.S.E., Lecturer on Chemistry, 

 Edinburgh, . . . .146 



IX. Description of a Water-Wheel, with Vertical Axle, 

 on the plan of the Turbine of Fourneyron, erected 

 at Balgonie Mills, Fifeshire. By Joseph Gor- 

 don Stuart, Esq., F.R.S.S.A. (Communicated 

 by the Royal Scottish Society of Arts), . 166 



