CONTENTS. 
IX 
PMt® 
Mr. G. Wilson on the Artificial Preparation of Sea-water for Marine Vivaria ,, 
Mr. Francis Wrightson on the Sewerage of Manufacturing Towns . 77 
GEOLOGY. 
Mr. A. Bryson on a curious Structure in the Silurian Slates of Pcebleshirc . 
Mr. Robert Chambers on the Great Terrace of Erosion iu Scotland, and it' 
Relative Date and Connexion with Glacial Pluenomena . 
_Farther Observations on Glacial Ptucnomena iu 
Scotland and the North of England. 
Rev. J. G. Gumming on some of the more Recent Changes in the Area of the 
Irish Sea. . . . ... 
Mr. John Cunningham on the Submarine Forest, Leasowc . 
Sir Philip Egerton on an Ichthyoid Fossil from India. . 
Professor Ehrenberg on the Discovery of Microscopic Shells in the Lower 
Silurian Rocks . . . .. 
Professor Edward Forbes on the Foliation of some Mctainorphic Rock* in 
Scotland . 
Captain Garden and Mr. W. H. Baily ou the Occurrence of a True Creta¬ 
ceous Formation in the South of Africa ...* 
Mr. G. B. Greenough on the Geology of India . 
Professor Haricness on Crustacean Impressions from the Trias of Dumfries¬ 
shire .. ..*. 
-on the Anthracite Deposits and Vegetable Remain* occur¬ 
ring in the Lower Silurians of the South of Scotland. 
-on Mineral Charcoal. 
- on Annelid Tracks from the Representatives of the Mill¬ 
stone Grits in the County of Clare . .. 
Mr. Edward Hull’s Abstract of Paper explanatory of a Geological Section, 
extending from the Island of Little Eye across the Peninsula between the 
Estuaries of the Dee and Mersey to the East, of Liverpool . 
Mr. J. B. Jukes on the One- Inch Map of the Northern Part of the County 
Wicklow , geologically coloured .. . 
Sir Roderick Impey Murcuihon’h General Observations on the Paleotoic 
Rucks of Germany....... 
Mr. James Nasmyth on the Structure of Lutmr Volcanic Craters . 
78 
78 
7 y 
80 
81 
82 
82 
82 
83 
83 
80 
86 
86 
86 
86 
87 
87 
91 
Mr. D. Page on the Subdivisions of the Pulir-ozoic Rocks of Scotland . 'I 
ou the Structure and Texture of Stratified Rocks, as a mean* of 
determining the Conditions under which they are formed . . 
Professor A. C. Ramsay on the former probable existence of Pabrozoic 
Glaciers ... 93 
-— -on the thickness of the Ice of the Ancient Glacier* 
of North Wales, and other points hearing on the Glaciation of the Country • '-'1 
Rev. Professor Adam Sedgwick on the May Hill Sandstone, and the Paliro- 
zoic System of England....,... '■ 
Professor John Irwine W iiitty on the Silurian Anthracite of Cavan. 
