46 GEOLOGY. 



its bed. The trap-dykes which cut through part of the district seem to 

 act in some cases as barriers, damming back part of the water, increas- 

 ing the supply, and also preserving its purity. E. T. H. 



Bristol and its Environs Historical Descriptive & Scientific Pub- 

 lished under the sanction of the Local Executive Committee of the 

 British Association. Pp. viii, 475. 8vo. London and Bristol. 

 Section VII. Physical Geography and Geology : — Physical Descrip- 

 tion, and History of Bristol Geology, pp. 319-326, by E. B. Tawney. 

 Silurian (U. Llandovery Sandstone, Wenlock Shales, and Limestones), 

 figs. 4-6, Devonian, with analyses of igneous rocks from Mendip and 

 Damory Bridge, figs. 7-13, and Carboniferous Period (the Clifton 

 section, with plate, L. Carboniferous shales, Mountain Limestone), pp. 

 326-354, by W. W. Stoddart. Coal Measures and New Red Period, 

 pp. .354-367, by E. B. Tawney. Eha^tic and Liassic Formations, pp. 

 367-377, by E. Tate. I^f. Oolite (and newer deposits), pp. 377-382, 

 by E. B. Tawney. H. B. W. 



Chemin de Fer Sous-Marin entre la France et I'Angleterre. Rap- 

 ports sur les Sondages executes dans le Pas de Calais en 1875. 

 Fol. Paris. 

 Contains three reports, separately paged. A. Lavelley, pp. 8, a 

 general report. E. Laronsse, pp. 15 (chart). Exploration du Detroit 

 pendant les mois d'Aoiit et Septembre 1875— giving a description of 

 the methods employed in examining the bottom of the Channel. 

 A. Potier et A. de Lapparent, pp. 16 (2 maps, sections, and woodcuts). 

 Rapport sur I'Exploration geologique sous-marin du Pas de Calais. 

 Gives the results of the soundings, mapping the outcrop of the " Craie 

 de Iloaen " from the French coast to within a few miles of the English 

 coast. W. T. 



Correspondence respecting the proposed Channel Tunnel and Railway, 

 Commercial Reports, no. 6. Pp.76. Fol. London. (Maps, plans, 

 and sections.) 



See also the following : — 

 Anon. Channel Tunnel : p. 48. 

 Baily, "W. H. British Fossils. Part lY. (General Remarks on 



the Geology.) Post, under Paljeontologt, Inveetebeata. 

 Barrels, C. Gault, Paris Basin. Refers to England : p. 49. 

 Brown, Dr. R. Papers on Greenland. Relates to ice-remains in 



Britain. Post, under Aectic Regioj^s. 



Dewalque, Prof. Gr. Cambrian, "Wales : p. b^. 



Durand, H. Channel Tunnel : p. 61. 



Kinahan, G. H. Granitic &c. Rocks of Yar Connaught. Post, 

 under Peteologt. 



. " Yalleys, &c." Largely illustrated from Irish Geology. Post, 



under Physical Geology. 



