AMERICAN NATURAL HISTORY. 



13 



Hitchcock (Edward). Description of a slide on Mount Lafayette, 

 at Franconia, New Hampshire.— Amer. Journ. Sc. 2d Ser. 

 XIV. 1852, 73. (110 



Horsford (Ebenezer N.). Solidification of the rocks of the Florida 

 reefs, and the sources of lime in the growth of corals. — - 

 Amer. Journ. Sc. 2d Ser. XIV. 1852, 245. (Ill 



r 



Hough (Franklin B.). On the existence of diluvial agencies during 

 the earlier geological periods. — Proc. Amer. Assoc. Adv. 

 Sc. VI. 1852, 262. * (113 



Hunt (T. S.). Remarks on the Lithological and Palseontological 

 characters of the Postdam sandstone. — Proc. Amer. Assoc. 

 Adv. Sc. VI. 1852, 271. (114 



Jackson (C. T.) and Percival (J. G-.). Reports on the Albert coal 

 mines. With a microscopic examination by Dr. John 

 Bacon, and chemical examinations by Dr. A. A. Hayes, 

 J. R. Chilton, Dr. Ure of London, Dr. John Torrey, Prof. 

 James C. Booth, and others. — Amer. Journ. Sc. 2d Ser. 

 XIII. 1852, 276. 115 



Lesquereux (Leo). On the coal bed of Zanesville. — Proc. Bost. 



Soc. Nat. Hist. IV. 1852, 175. (116 



LOGAN (W. E.). On the age of the copper-bearing rocks of Lake 

 Superior and Huron, and various facts relating to the 

 physical structure of Canada. — Rep. Brit. Assoc. Adv. Sc. 

 for 1851. London, 1852, 59. (117 



Logan (W. E.) and Salter (J. W.). On the rocks of Canada. 



1. On the age of the copper-bearing rocks of Lake Superior 

 and Huron, and various facts relating to the physical 

 structure of Canada. By W. E. Logan. 2. Note on the 

 fossils above mentioned, from the Ottawa river. By J. W. 

 Salter.— Amer. Journ. Sc. 2d Ser. XIV. 1852, 229. (118 



NORWOOD (Joseph Gr.). Geological report of a survey of portions 

 of Wisconsin and Minnesota, made during the years 1847, 

 '48, '49, and '50, under the direction of David Dale 

 Owen.— Owen's Rep. 1852, 209. (120 



