414 



INDEX. 



Locke, Dr. John, on magnetic dip and in 



tensity in Ohio, 157. 

 Longitude, determination of an arc bc' 

 tvveen Armagh and Dublin, 113. 



of City Hall, New York, 11,3 

 of several places in Michigan 

 154. 

 Loomis, Prof E., on magnetic dip and 

 intensity in Ohio, 397. 



M. 



Mackerel shark's intestine, 197. 

 Mygnetic dip and intensity, mode of de- 

 termination, 179. 



in Ohio, 157. 

 Magnets, best positions of three for mu- 

 tual action, 86. 

 Map, geological, of Cornwall and Devon. 



124. 

 Mathematics and physics, section A, Brit- 

 ish Association, report 9th meeting, 94. 

 Matter not infinitely divisible, 113. 

 Mechanical science, section G, of British 



Association, report 9th meeting, 136. 

 Medical science, section E, British Asso 



ciation, report 9th meeting, 133. 

 Medium, resisting theory of, 246. 

 Melania Cincinnatiensis, 175. 

 Metallic tin, action of on solutions of mu- 

 riate of tin, 408. 

 Metals, galvanization of, 119. 

 Meteoric mass, description and analysis 

 of, 250. 



observations in November and 

 December, 1839, 377. 

 Meteors of November, 1838, as observed 

 at Philadelphia, and elsewhere, 173, 

 176, 179. 

 Meteorology of elevated regions, 102. 

 American, report on, 95. 

 Meteorological hourly observations, 95. 

 observations made at equi 

 noxes and solstices to be reduced, 95. 

 observations at Great Mai 

 vern, 102. 



at Plymouth, 

 Eng., 109. 



phenomena at Ghats, W. 1. 

 103. 



Journal, kept at New York 

 for 1838-9, 323. 



at St. Johns, N 

 B., and Canton, China, 265. 



at Marietta, 

 Ohio, 273. 

 Mica used in polarizing light, 101. 

 Minerals and shells presented to N. Y. 

 Lyceum Nat. History, by Dr. Brinck- 

 erhoff, 198, 201. 

 Minerals, new ones mentioned from S. 



America, 410. 

 Mitchell, Wm., on tails of comets, 37. 

 Mollusca, pulmoniferous, 131. 



Morgan, K. G., on galvanism in blasting 



rocks, 33. 

 Morse, S. F. B., on the twilight bow, 389. 

 Morton, S. G., his Crania Americana re- 

 viewed, 34l. 

 Murchison, R. I., letter to Prof Silliman 

 on British Association, 406. 



letter to Prof. Silliman 

 on classification of rocks, 408. 

 Murchison's Silurian system, 86. 



on geological map of Europe, 

 126. 



on a part of Germany, ]26. 



N. 



Natural History Society of Boston, pro- 

 ceedings of, 391. 



Newfoundland, meteorological observa- 

 tions at, 265. 



Nomenclature of the stars revised, 94. 



Nulty on formulae for comets, 160. 



O. 



Observations of magnetic dip and inten- 

 sity in Ohio, 397. 



Observatory at Cape of Good Hope, 95. 

 at Girard College authorized, 

 398. 



magnetic, their establishment 

 recommended by British Association, 

 108. 



Observatory, letter from Prof. Encke on, 

 to Prof Bache, 183. 



OErsted's memoirs on tornadoes, 82. 



Orchis tribe, synonymy of several spe- 

 cies, 306. 



Osier, Mr. F., on indications of his ane- 

 mometer, 103. 



Parasite of the eggs of Geometra verna- 

 ta, 385. 



Parker, P., meteoric observations at Can- 

 ton, August, 1839, 301. 



Paving with wood, 136. 



Peat bogs, 127. 



Peltier on tornadoes, 401. 



Pendulum, new compensating, 274. 



improved compound, by W. J. 

 Frodsham, 107. 



Perry, Thos. H., on a resisting medium, 

 246. 



Philosophical (Amer.) Society, proceed- 

 ings of, 153, 396. 



Photogenic drawing, Talbot's remarks 

 on Daguerre's process, 97. 



Photometer, new, described by Dr. Dau- 

 beny, 97. 



Pipe Stone quarry on Coteau des Prai- 

 ries, 139. 



Phrenology, lectures on, by G. Combe, 

 390. 



Physick, Dr. P. S., notice of, 155. 



