47 
54, Abstract of Geological Investigations made in China 
and Mongolia, by Raphael Pumpelly. (Communi- 
cated by J. D. Whitney.) ; 
95. Examination of Shells obtained by the Sounding-Lead 
in the Coast Survey of New York and New Jersey, 
with some Nautical Hints, by Augustus A. Gould. 
56. On the probable immediate Cause of the Glacial Epoch 
of the Post-Tertiary, by A. Guyot. 
57. On the Lower Silurian Oils of Kentucky and Ten- 
nessee, by J. S. Newberry. 
58. Suggestions relative to the Annular Eclipse of the Sun, — 
of October next, by S. Alexander. 
59. On Certain Converging Series expressing the Ratio of 
the Diameter to the Circumference of the Circle, 
by William Ferrel. (Communicated” by Benjamin 
Peirce.) 
60. On a Tide-Meter, by J. M. Batchelder. (Communi- 
cated by Benjamin Peirce.) 
