i68 Bibliography : Geology of the North of England. 
Reid, E. M. Durham. 
Paleophytologie [abstracts of papers on] . Rev. de Geol., Juin., pp. 
278-280. 
Reynolds, S. H. [Secretary] . Westmorland, Yorkshire. 
Photographs of Geological Interest. Twentieth Report of Com- 
mittee. Brit. Assoc. (Edinburgh), Leaflet, 10 pp. 
Richardson, W. Alfred. Nottinghamshire. 
The Relative Age of Concretions. Geol. Mag., March, pp. 1 14-124. 
Richardson, W. Alfred. Northern Counties. 
The Micro -petrology of the Rock -gypsum of Nottinghamshire. 
Min. Mag., September, pp. 196-207 ; also Nature, July 7th, pp. 
605-606 ; Nat., December, p. 386. 
Roberts, John. Northern Counties. 
The Carbonization of Coal at Low Temperature. Trans. Inst. Min. 
Eng., November, pp. 9-32. 
E. J. Russell. Northern Counties. 
The Improvement of Peaty Soils, Part I. — -The True Peats. Journ. 
Minis. Agric. March, pp. 1104-1113. 
Sargent, H. C. Derbyshire. 
The Lower Carboniferous Chert Formations of Derbyshire. Geol. 
Mag., June, pp. 265-278. Noticed in Nat., July, pp. 220-229 ; 
Phil. Mag., January, pp. 159-160. 
Sheppard, T. Northern Counties. 
The Evolution of Topographical and Geological Maps [Presidential 
Address to Conference by Delegates, British Association]. 
Rep. Brit. Assoc, for 1920, pp. 391-404. 
Sheppard, T. Northern Counties. 
List of Papers bearing upon the Zoology, Botany and Prehistoric 
Archaeology of the British Isles, issued during June -Decem- 
ber, 1919. Rep. Brit. Assoc, for 1920, pp. 406-435. 
Sheppard, T. Yorkshire, Lake District. 
The Origin of the Materials used in the manufacture of Prehistoric 
Stone Weapons in East Yorkshire. Hull Museum Publications, 
No. 122, pp. 34-54- 
Sheppard, T. Yorkshire, Lincolnshire. 
Pseudodiadema variolare (Brongniart) in the Lower Chalk of 
North Lincolnshire. Nat., May, p. 181. 
Sheppard, T. Northern Counties. 
Bibliography : Papers and Records relating to the Geology of the 
North of England (Yorkshire excepted), published during 
1920. Nat., June, pp. 217-220 ; July, pp. 249-253. 
Sheppard, T. Northern Counties. 
Cristallographie et Mineralogie Petrographie et Lithologie. Geol - 
ogie Generate. Tectonique. Geographic physique [abstracts 
of papers in Nat., 1915-1919]. Revue de Geologie, January, pp. 
15-34- 
\ 
Sheppard, T. Northern Counties. 
Paleoconchologie [notice of papers on] , Rev. de Geol. Aout, pp. 410-411. 
Sheppard, T. Northern Counties. 
Coelenteres [notice of papers on], tom. cit., pp. 418-419. 
Naturalist 
