t. 



306 American Association for the Advancement of Science. 



On the Solar Light ; by D. Yatjghan, of Ciucinnati. 



Daguerreotypes of the late Solar Eclipse, and of Spots on the Sun ; hy David A. 



"Wells, of Cambridge. 



The bearing of some recent Microscopical results upon the present Theories of 



Light ; by Dr. "W* J. Burnett, of Boston. 



On the Zodiacal Light; by Prof. D. Olmsted, of Yale College, 



On deep Sea Soundings ; by Lieut. M. F. Malt^y, JJ. S. N". 



Observations on the Echpse of the Sun, July 28th, 1851 ; by Prof. Philip Ten Etck, 



of Albany. 



Experimental Kesearches, tending towards an Improvement in the Telescope, by 



Prof. Alexander C. Twinikg, of New Haven. 



Results of a set of Observations in repetition of Eoucault's Experiments ; made 



at Providence, R. I., by Profs. Carswell and ^Norton. 



On the Pendulum Experiment; by Prof. J. D. Dana, of Yale College. 



The Pendulum at Bunker Hill Monmnent; by Prof. E. N. Horsfoed, of Harvard. 



The Effect of Heat on the FerpendicuLirity of Bunker Hill Monument ; by the 

 same. 



On the use of air as a medium for conveying mechanical Power ; by Lieut. E. B, Hunt, 



On the Proper Measure of Mechanical Force ; by Prof. J. H. C. Coffin, of Lafay- 

 ette College. 



The occurrence of placid water in the midst of large areas where waves are con- 

 stantly breaking ; by Prof. Horsford. 



2. JVIeteoeglogt, 



On the distribution of rain for the month of September; by Prof. E. Loomis. 



On the Clouds and Equatorial Cloud-rings of the Earth ; by Lieut. Maury, U. S. K, 

 Superintendent of the Washington Observatory. 



On Ocean Temperatures ; by the same. 



A Comparison of the Diurnal Law of the Mean Irregular Fluctuation of the Mag- 

 netical Elements at the stations of Observation in North America ; by Capt. Lefroy, 

 of the Toronto Observatory. 



On the Influence of Terrestrial Electricity on Climates ; by D. Vaughan. 



On the Quantity of Rain at different heights, from observations made at the Insti- 

 tution for the Deaf and Dumb ; by Professor Morris, of New York. . 



Temperature at Hartford, Connecticut, with a Map; by Professor Brocklesbt, 



On the Meteorological Observations of New York, from 1S25 to 1850; by Dr, 

 Franklin B. Hough, of New York. 



On the Progress of the System of Meteorological Observations conducted by the 

 Smithsonian Institute, and the propriety of an immediate extension of it throughout 

 the American Contbent; by Profl E. Guyot, of Cambridge. 



3. CnEMISTEY. 



Relation of the Chemical Constitution of Bodies to Sight; by Prof. E. N. Hoes- 

 roRD, of Harvard. 



Solidification of the rocks of Florida Reef; by the same. 

 On the permeability of Metals to Mercury ; by the same. 

 Plasticity of Phosphorus ; by the same. 

 Note on Ammonia in the Atmosphere ; by the same. 



On the existence of organic matter in Stalactites and Stalagmites, containing 

 Crystallized and Amorphous Crenate of Lime : bv D. A. Wells. Cambridge. 



On a New Method for the Analysis of Soils ; by the same. 



On the Soils of Pike county, Scioto valley, Ohio ; by the same. 



On the Value of Soil Analysis, and the points to which special attention should 

 be directed; by Prof. Joux P. Norton, Yale College. 



Comparative Analyses of Ash. from premium samples of 8-rowed yellow Indian 

 com ; by Masox C. Weld, of the Yale Analytical Laboratory, New Haven. 



Analysis of Bituminous Coal-ash ; by George W. Weyman, Yale Analyt. Lab. 



Analysis of the Ash of a Cotton Stalk ; by O. Judd, Yale Analyt. Lab. 



On the Volatilization of Phosphoric Acid m acid solutions ; by the same. 



Analysis of the Cucumber and other substances; by Dr. J. H. SAUSBrKT, of 

 Albany. 



On the Separation of Butter from Cream by catalysis; by President Ed'vvakd 

 Hitchcock, of Amherst. 



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