46 
37. On a Regulator for maintaining Uniform Motion, and 
an Apparatus for recording Time-Observations 
Type, by J. E. Hilgard. 
88. On the Progress of the Geological Survey of ~; 
fornia, 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. 
Hilgard. 
' 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 Differ- 
ential Calculus, by Theodore Stron 
50. On the Ages of United States ‘Vdinitete Soldiers @s 
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 og 
Continent of North America owes its present 
figuration, by J. D. Whitney. 
