368 APPENDIX 



1 Passages in the History of Geology. Two Lectures at University 

 College, London. 8vo. London, 1848, and second lecture 

 1849. 



On some points connected with the Physical Geology of the 

 Silurian district between Builth and Pen-y-bont, Radnorshire. 

 Rep. Brit. Assoc. for 1848 [1849]. Sections, p. 73. 



1850 



On the. Geological Phenomena that have produced or modified the 

 Scenery of North Wales. Friday evening discourse at Royal 

 Institution. Athenaum, 6th April 1850, p. 377. 



On the Geological Position of the Black Slates of Menai Straits, etc. 

 Rep. Brit. Assoc. for 1850 [1851]. Sections, p. 102. 



1852 



On the Science of Geology and its Applications. Introductory 

 Lecture to the Course of Geology, School of Mines, Session 

 1851-52. Records School of Mines, vol. i. pp. 81-102. 



On the Superficial Accumulations and Surface-markings of North 

 Wales. Quart. Jour n. Geol. Soc. vol. viii. pp. 371-376. 



1853 



* On the Physical Structure and Succession of some of the Lower 

 Palaeozoic Rocks of North Wales and part of Shropshire, with 

 Notes on the Fossils by J. W. Salter. Quart. Journ. Geol. Soc. 

 vol. ix. pp. 161-179. 



1854 



On the Geology of the Gold-bearing District of Merionethshire, 

 North Wales. Quart. Journ. Geol. Soc. vol. x. pp. 242-247. 



On the former probable existence of Palaeozoic Glaciers. Rep. 

 Brit. Assoc. for 1854 [1855]. Sections, pp. 93, 94. 



On the thickness of the Ice of the ancient Glaciers of North 

 Wales, and other points bearing on the Glaciation of the 

 Country. Rep. Brit. Assoc. for 1854 [1855]. Sections, pp. 



94, 95- 



On the occurrence of Angular, Subangular, Polished, and Striated 

 Fragments and Boulders in the Permian Breccia of Shropshire, 

 Worcestershire, etc. ; and on the Probable Existence of Glaciers 



