260 INDEX. 



Correspondence, nature and extent of 22 



Correspondence relative to acceptance of Squier & Davis's v.-ork 141 



Cost of publishing Scientific works ... 136 



Cox, Dr. Samuel H., Lectures by 230 



Cromwell and Queen Elizabeth, Lectures on 251 



Croton Water, microscopic organisms in 18 



Cuba, Institutions in 50 



Cubic Equations, new method of solving 171 



Culbertson, Alexander 200 



Culbertson, Thaddeus 227, 220, 199, 12 



Dakota Language, Grammar and Dictionary of. 214 



Darlington, Dr. William 16 



Darlingtonia Californica 16 



Darwin, Dr., Researches by 239 



Davis, Hon. Jefferson, Opinion respecting Museum of Exploring Expedition 252 



Davis, Lieutenant C. H. , Lectures by 207 



Davis, Lieutenant C. H., Memoir on the Tides, by 215 



Denmark, Institutions in 41 



Derby, H. W., Agent 51 



Description of Ancient Works in Ohio 236 



Diffusing Knowledge, means of. 138, 130 



Directions for Collection and Preservation of specimens of Natural History 241, 217 



Distribution of publications 242, 194, 37 



Domestic Exchanges 51 



Donation from Dr. Hare 180, 167 



Donors to Museum 57 



Downes, John, Occultations for 1849, by 160 



Downes, John, Occultations for 1850, by 173 



Downes, John, Occultations for 1851 , by 201 



Dynamical Phenomena of Geology, Lectures on 207 



Dynamic effects of the Tides 215 



Earth, Air, Fire, Water, Lectures on , 251 



Earthquake, Instrument for measuring 164 



Ehrcnberg, Professor 17 



Eighth Annual Report presented 3 



Electrical Rlieometry 236, 172 



Electricity, recent discoveries in 19 



Elgin Marbles, Moulds from , proposed 78 



Ellet, Charles, Jr 171 



Emory, Major W H 204, 177 



Engelman, Dr. George, Agent 51 



English Language, History of. Lecture on 230 



Engravings, Valuable Collection of, procured 205 



Entomology, Lecture on 230 



Ephemeris of Neptune 221, 201, 173, 160 



Erosions of the Surface of the Earth 200 



Espy, Professor 19G, 175, 161, 147 



Establishment, Members of 6 



Establishment, meetings of. 109 



Estimates to be made by Executive Committee and Secretary 78 



Ethnology 232, 228, 219, 203, 178, 172, 140, 54, 14 



Etlmological Chart 178 



