EXPLANATION OF THE PLATES. 



PLATE VII Fig. 1 Profile of the bill of adult Cygnus BewkUi. 



Fig. 2.— View of ditto as seen from above. 



Fig. 3. — Keel and part of sternum of young male Cygnus Bewiciii, shewing the excavation for 

 the reception of the horizontal loop, at the posterior extremity of the keel. 



PLATE VIII. 

 Illustrates the Rev. W. Turner's Observations on the Mechanical Feats of a small Spider, 



Article VII. page 42. 



PLATE IX. 



Section to illustrate Mr. Michael Forster's Notice on the Effects of a Basaltic Dyke at But- 

 knowle Colliery, Article VIII. page 44. 



PLATE X. 



Sections to illustrate Mr. Francis Forster's Observations on the Geology of Ratcheugh Crag, 



Article XII. page 75. 



PLATE XI. 



Sections across the Mineral Basin of South Wales to illustrate Mr. Francis Forster's Obser- 

 vations on the South Welsh Coal Basin, Article XIV. page 82. 



PLATE XII. 

 Map of the Course of the Tweed, illustrates Mr. Winch's Remarks, Article XV. 



page 117. 



PLATE XIII. 

 Portrait of Thomas Bewick, illustrates Mr. Atkinson's sketch of his Life, Article XVI. 



page 132. ' 



PLATE XIV. 



No. 1, Plan, and No. 2, Section of a Group of Dykes in Whitehaven Colliery, illustrates 



Mr. Peile's Description, Article XVII. page 160. 



PLATES XV. and XVI. 

 Illustrate Mr. Dunn's Account of Gilmerton Colliery, Article XVIII. page 165. 



PLATES XVII. and XVIII. 

 Illustrate Mr. Buddie's Account of the Explosion in Jarrow Colliery, Article XX. pa^e 



184. 

 PLATE XVII — Sections of the Drewitt District Jarrow Colliery. 



