See ER re eae es SMES NEE eR Ene | te ee ee aS ee ee ee ee le a eS ee i 
CONTENTS OF VOLUME XLII. 
NUMBER CXXIV. 
P: 
Art. I. Deseription of an Ancient raoo er Mound near New- 
ark, Ohio; by O. C. Marsn, - : - - 
JI. On the production of Thermo-electric currents by Pee ; 
by Prof.O. N. Roop, - 
Hl. A Classification of Mollusca, er on ee Princip of Cop 
alization; by Epwarp S. Morse, - 
12 
19 
IV. Petroleum in its Geological relations ; by Prof BE. B. Axons, 33 
43 
V. Notes on Japanese Alloys; by Rapuast PumPELiLy, - 
VI. Notes on Tides at Tahiti, and a apart: o 
Dr. C. F. Winstow,  - 
VIL. Further Contributions to the Sunes of as sad Magnesia 
Salts; by T. Srerry Hunt, - - : - 
‘VIII. Remarks on the new division of the Eocene, or - Shell Bluff 
Group, proposed by Mr. Conrad; by Evc. W. Hitcarp,~ - 
IX. Preliminary Notice of certain beds of Fish-remains in the 
Hamilton abe 3 of Western New York; by Frank H. 
BrabD.ey, 
X. On the Anpicnion Arnage by F. 's. ca Se fae! 
LerrMa - - 
XI. On aia a new ‘Mineral Beales sy the ner. os 
Rockport, Mass. ; by Josian P. Cooke, SJr., i 
XII. Memorandum of a variable or temporary Star of the eee 
Magnitude, seen in the Northern — mays 1866 ; i 
E. J. Farquaar, . 
XIII. New and Brilliant Variable Bars om B. A. Gasaier - - 
XIV. On the Emery Mine of Chkatars Hampden County, Mass., 
with remarks on the nature of Emery, and its associate 
minerals; by J. Lawrence Situ, 
XV. On some minerals associated with the Cryo’ in oecuibes 
by G. Hacemann, - a " a 
Bese 
45 
70 
73 
80 
