7 
47 
38. On the Progress of the Geological Survey of California, 
by J. D. Whitney. 
39. On the Mineral Lands of the United States, and the 
Relations of the Government to their Management, 
by J. D. Whitney. 
40. On the Origin and Formation of Sedimentary Rocks, 
by J..S. Newberry. 
41. On the Origin and Distribution of Petroleum in the 
United States, by J. S. Newberry. 
42. The Theory of the Sling, by Benjamin Peirce. 
43. The Fucoids of the Coal Measures, by Leo Lesquereux. 
44, Letter from Mr. Agassiz. ; 
45. Observations of the Right Ascensions of Stars within 
one Degree of the North Pole, by B. A. Gould. 
46. On Observations of Tides at the Island of Tahiti, 
made for the United States Coast Survey, by J. E. 
gard. ; 
47. Discussion of Magnetic Observations made at Eastport, 
Maine, during the Years 1861-1864, by the United 
States Coast Survey, by J. E. Hilgard. 
48. On Rifled Guns, by W. H. C. Bartlett. ; 
49. A New Theory of the First Principles of the Differen- 
tial Calculus, by Theodore Strong. 
50. On the Ages of United States Volunteer Soldiery as 
deduced from the Statistical Bureau of the Sanitary 
. Commission, by B. A. Gould. 
51. On a Photometer, by O. N. Rood. 
52. On the Structure of the Moon, by S. Alexander. 
53. On the Systems of Mountain Upheaval to which the 
“Continent of North America owes its present Con- 
figuration, by J. D. Whitney. 
54. Abstract of Geological Investigations made in China 
and Mongolia, by Raphael Pumpelly. (Communi- 
cated by J. D. Whitney.) 
