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on the Intrusive Character of the Whin Sill of Northumberland : 

 73-75. 



1877, February, No. 16. Pg. 81—160. 

 R. Mallet: on the Conversion of the Geysirthroats in Iceland into Vol- 



canic Vents: 108—109. 

 W. F. Hillebrand: on the Specific Heats of Cerium, Lanthanum and Di- 



dymium: 109-119. 

 N. S. Maskelyne: Note on the Optical Characters of Ludlamite: 135 — 137. 

 Geological Society. McKenny Hughes: on the Silurian Grits near 



Corwen, North Wales; W. Morgan: on Mineral Veins; J. F. Blake 



and W. H. Hudleston: on the Corallian Rocks of England: 153—156. 



12) The American Journal of Science and Arts by B. Silliman 

 and J. D. Dana. New Häven. 8°. [Jb. 1877, p. 292.] 

 1877, February, vol. XIII, No. 74; pg. 89—168. 



W. M. Fontaine: Notes on the Vespertine Strata of Virginia and West 

 Virginia: 115. 



S. W. Ford: Note on Microdiscus speciosus: 141. 



Ellias Lewis jr.: on Water Course upon Long Island: 142. 



T. A. Conrad: Note on the relations of Bdianus Estrellanus of the Cali- 

 fornia Miocene: 156. 



C. S. Wilkinson: Miocene in Southern New Guinea: 157. 



J. H. Collins: Henwoodit and Enysit: 162. 



