Part 21

Luminous appearances in the atmosphere, _J. A. Allen_, iv, 341.

Lunar distance, instrument for finding, _M. F. Maury_, xxvi, 63.^f

Lungs, disease from dust in, xxxiv, 29.

Lupulin, remarks on, xii, 388.

Lute or cement, Willis's, vii, 392. ---- for bottling wine, &c., xxiv, 205. ----, see farther, _Cement_.

Luther, statue of, v, 181.

Lyceum of Natural History, New York, abstract of the proceedings of, ii, 366; vi, 361; vii, 171; viii, 192; ix, 387; x, 198; xiii, 378; xiv, 190; xv, 191, 357; xvi, 205, 354; xviii, 193; xix, 159, 353; xxvii, 148; xxviii, 189; xxxvi, 195. ---- ibid, officers of, viii, 192; xv, 193; xvi, 355; xxxii, 204; xxxvi, 195; xlviii, 404. ----, ibid, memorial of, on a geological survey of N. York, xvi, 358. ----, ibid, annals of, commenced, vii, 359;--noticed, xxxiv, 214. ----, Naval, of Brooklyn, xxvii, 390. ----, at Troy, ii, 173.

Lychnopora, a new genus from S. America, notice of, ix, 375.

Lycoperdon tuber, or Indian bread, ii, 369. ---- giganteum, xxxviii, 391.

Lycopodites, generic characters of, vii, 180.

Lycopodium, remark on the yellow powder of, xxxix, 399. ---- annotinum, xlv, 46. ---- inundatum, xlv, 47. ---- selago, xlv, 48.

_Lyell, C._, medal of the Royal Society conferred on, xxx, 174. ----, address before the Geological Society of London, 1837, xxxiii, 76. ----, on the changes of climate on the earth in past times, xx, 377. ----, coal formation of Nova Scotia, and on the age and position of the gypsum, xlv, 356. ----, upright trees in the coal strata of Nova Scotia, xlv, 353. ----, on the cretaceous strata of New Jersey, xlvii, 213. ----, on the elevated beaches, and boulder formations of the Canadian lakes and valley of St. Lawrence, xlvi, 314. ----, on the elevation of Sweden, xxviii, 72, 387. ----, footprints of birds in the Connecticut valley, xlv, 394. ----, views on granite, xxxiii, 116. ----, probable age of graphite and anthracite in the mica slate at Worcester, Mass., xlvii, 214. ----, geological position of the mastodon at Big Bone Lick, Ky., and elsewhere, xlvi, 320. ----, geology of, 4th edition, notice of, xxix, 358. ----, proposed visit to the United States, xli, 403; xlii, 213.

_Lyon, L._, on surveying instruments, xiv, 268.^f

M.

_Macaire_, vegetable physiology in relation to rotation of crops, xxiii, 138. ----, injurious action of gases on vegetation, xxiii, 193. ----, on nitrogen in animal substances, xxiii, 384. ----, experiments on hydrochloric acid, xi, 393.

_McConnell, B. R._, notice of a revolving electro-magnetic instrument, xxxiii, 188.

_McCord, J. S._, meteorological observations at Montreal, 1836-40, xli, 330.

_MacCulloch, J._, essay on remittent and intermittent fevers, xviii, 338.

_McGuire, W. W._, on the prairies of Alabama, xxvi, 93;--causes of, xxvi, 96.

Machine for cleaning grain invented, iv, 387. ---- and its model, relation between, _E. Sang_, xxiv, 264.

Machines, examination of, maximum and minimum effect of, _A. B. Quinby_, xii, 346. ----, electrical, see _Electrical_.

Machinery, use of soapstone in diminishing friction of, xiii, 192. ---- and manufactures, economy of, xxiv, 105.

Macle, see _Chiastolite_.

_Maclure, W._, on different systems of education, ix, 160, 163. ----, on the Pestalozzian system of, ix, 163; x, 145. ----, geological arrangement, outlines of, i, 209. ----, systematic arrangement of rocks and their probable origin, vii, 261. ----, geological systems, geological maps, and chatoyant feldspar, ix, 253. ----, ---- changes in N. America, conjectures on, east of the Stoney mountains, vi, 98. ----, ---- remarks on Mexico, xx, 406. ----, igneous theory of the earth, remarks on, xv, 384; xvi, 351. ----, on Mosaic geology, ix, 157. ----, passage to Mexico of, xv, 400. ----, memoir of, _S. G. Morton_, xlvii, 1.^f ----, list of works of, xlvii, 16.

Maclurite, description of, v, 246. ----, analysis of, _H. Seybert_, v, 336. ----, identical with chondrodite, v, 366. ----, in New Jersey, v, 343.

Madeira, notice of, xxiv, 238. ----, wines of, xxiv, 240.

Mæcenas, bust of, xxxiv, 51.

_Maerenhaut, J. A._, on Otaheite, xxix, 283.

_Magendie, F._, on the mechanism of absorption in animals, iii, 288. ----, on prussic acid, ii, 81.

Magic, natural, remarks on, xxxiii, 258.

Magnesia, effect of, on soil, xli, 159. ----, solubility of, v, 378. ----, in compact limestones, large proportion of, _R. E. Rogers_, xli, 171. ----, carbonate of, of Staten Island, N. Y., i, 142; v, 266. ----, ----, in Pennsylvania, i, 236; xiv, 18. ----, hydrate of, description and analysis of, iv, 245. ----, ----, in New Jersey, i, 55; iv, 17; v, 267. ----, ----, in Hoboken, i, 54; iv, 17; vii, 370. ----, ----, from Shetland, vii, 365. ----, nitrate of, i, 133. ----, sulphate of, i, 133; ii, 375; xv, 241. ----, ----, native in New York State, xv, 241. ---- and soda, sulphate of, xlviii, 189.

Magnesian carbonate of lime, in N. York, analyses of, _L. C. Beck_, xlvi, 34. ---- hydrate of silica. Harford Co., Md., _P. T. Tyson_, xviii, 79. ---- ---- ---- identity of, with Deweylite, _C. U. Shepard_, xviii, 81. ---- pseudomorphs, and metamorphic changes, xlviii, 89.

Magnesite, hard, from Baumgarten, Silesia, vii, 368. ----, in N. York, v, 267; xlvi, 34. ----, in Maryland, xiv, 12. ----, in Pennsylvania, xiv, 9, 10.

Magnesium, notice of, xix, 197, 379; xxvii, 196. ----, obtained by _W. W. Mather_, xx, 408.

Magnets, cast iron, xxxiii, 265. ----, chemical action in needles suspended from, xviii, 402. ----, best position of, for mutual action, _H. Lloyd_, xxxviii, 96. ----, current produced by the rotation of, _Pixii_, xxiv, 144, 146.^f ----, electric spark from, _J. Henry_, xxii, 403. ----, a mode of producing sparks and galvanic currents from the horse shoe, _J. P. Emmet_, xxiv, 78.^f ----, new method of making permanent, xxxvi, 335.^f ----, galvanic, construction of, _J. B. Zabriskie_, xxxvi, 124.^f ----, ----, Henry's large, xix, 408.^f ----, ----, made for Laboratory of Yale College, xx, 201. ----, ----, Humbert's, xxxviii, 204. ----, ----, Ganby's, xxix, 354. ----, ----, Page's, xxxv, 253.^f ----, ----, E. M. Clarke's, xxxiii, 213.^f ----, ----, see farther under _Electro-Magnetic_ and _Magneto-Electric_. ----, musical tones from, _C. G. Page_, xxxii, 396; xxxiii, 118; xlviii, 401. ----, cause of voltaic currents with, _J. P. Emmet_, xxvi, 23.^f ----, native, in Rhode Island, iv, 285; v, 402.

Magnetic attraction and repulsion, law of, _R. W. Fox_, xxviii, 370. ---- ---- ---- reciprocating motion of, _J. Henry_, xx, 340.^f ---- chart, of the U. States, _E. Loomis_, xxxiv, 290; xxxix, 41. ---- compass, mariner's, on the invention of, _A. Humboldt_, xl, 242. ---- dip, in different parts of the world, _T. H. Perry_, xlvii, 84. ---- ----, at different places in Europe, xl, 30. ---- ----, in Ireland, _H. Lloyd_, xxxv, 296. ---- ----, at Perth, Scotland, xl, 342. ---- ----, at St. Petersburg, xxi, 382. ---- ----, at different places in the U. States, xl, 380. ---- ----, ibid, _J. Locke_, xxxix, 319; xl, 149; xli, 15. ---- ----, ----, ibid, remarks on, xxxix, 325. ---- ----, ibid, _E. Loomis_, xxxiv, 290^f; xxxix, 41^f; xl, 85. ---- ----, at various places in Ohio and Michigan, _E. Loomis_, xxxviii, 397. ---- ----, ---- ibid, at Cincinnati, _J. Locke_, xl, 56. ---- ----, at Philadelphia and Baltimore, _A. D. Bache_, xl, 375. ---- ----, at Baltimore, _J. Locke_ and _J. N. Nicollet_, xlii, 239. ---- ----, at Nantucket, _W. Mitchell_, xlvi, 157. ---- ----, daily variation in, _Kupffer_, xxv, 194. ---- ---- and intensity determined by one instrument, _H. Lloyd_, xxxviii, 179. ---- discoveries by _H. H. Sherwood_, xxxiv, 210. ---- effects from Hare's calorimotor, _G. T. Bowen_, v, 357. ---- experiments, showing the effect of cold and heat on steel bars, _Kupffer_, xxv, 194. ---- influence of the sun's rays, xiii, 188; xviii, 181. ---- ---- of the violet ray, xviii, 171. ---- instrument, new, called a Solar Index, _M. Conant_, xlix, 301.^f ---- iron, see _Iron_. ---- intensity, at great elevations, _J. D. Forbes_, xxxi, 369. ---- ----, at different places in Europe, xl, 30. ---- ----, in Ireland, _H. Lloyd_, xxxv, 296. ---- ----, daily variation and changes in, _H. Lloyd_, xlvi, 391. ---- ----, in different places in the United States, xl, 378. ---- investigations, by _W. Scoresby_, xlviii, 33. ---- needle, dipping, theory of adjusting, _T. H. Perry_, xxxvii, 277. ---- ----, ----, manipulations of, _J. Locke_, xlii, 235. ---- ----, dip of, see _Magnetic dip_. ---- ----, on the influence of the Aurora on, xxxiv, 285. ---- ----, ibid, _Franklin_, xvi, 148. ---- ----, ibid, _J. Henry_, xxii, 143. ---- ----, ibid, of Jan., 1837, New Haven, xxxii, 179. ---- ----, ibid, in July, 1837, xxxiii, 146. ---- ----, ibid, at Schenectady, Jan., 1837, &c., _B. F. Joslin_, xxxv, 152. ---- ----, ibid, Nov. 14, 1837, _E. C. Herrick_, xxxiv, 269. ---- ----, ibid, xl, 48. ---- ----, ibid, May, 1840, at Toronto, xl, 337. ---- ----, ibid, as seen at Greenwich, xl, 338. ---- ----, influence of coasts on the deflection of, xxviii, 62. ---- ----, ---- of heating to the temperature of boiling water, xxxviii, 180. ---- ----, influence of iron cooled to a low red heat, xxix, 348. ---- ----, improvement in the manufacture of, _A. Eaton_, xii, 14. ---- ----, improvement in, reply to the same, xii, 232. ---- ----, made of thin plates not in contact, _W. Scoresby_, xxxiv, 398. ---- ----, oscillations of, differing near different metals, xv, 182. ---- ----, polarity and dip of, a remark on, xxix, 353. ---- ----, made to indicate the true north, xxvi, 90. ---- ----, on the connexion of the theory of the earth with the secular variations of, _J. H. Lathrop_, xxxviii, 68. ---- needles, best position of three, for mutual action, _H. Lloyd_, xxxviii, 96. ---- observations, a union of effort urged for carrying on, xviii, 380. ---- ----, great scheme for, by the Royal Society of London, xxxvii, 198. ---- ----, ibid, by British Association, xl, 335; xlii, 151; xliii, 374. ---- ----, in Russia and other countries, in progress, xlii, 153. ---- ----, coöperation of the Amer. Acad. of Arts and Sciences in a general system of, xxxix, 193. ---- ----, corresponding, by _A. D. Bache_ and _H. Lloyd_, xli, 260. ---- observatory at Dublin, xxxiv, 3. ---- poles, revolution of the two, xxix, 352. ---- polarity, notice of, _D. H. Barnes_, xiii, 70. ---- ----, reply to _D. H. Barnes_, xiv, 121. ---- ---- of rocks, xx, 198. ---- power of a galvanic battery, v, 388. ---- separating machine for magnetic ores of iron, used at Franconia, xviii, 289. ---- variation, daily, different in different places, xix, 189. ---- ----, at Perth, Scotland, xl, 342. ---- ----, at Paris, France, xxxi, 190. ---- ----, remarks on, _N. Bowditch_, xvi, 64. ---- ----, for the United States, _E. Loomis_, xxxiv, 290^f; xxxix, 41^f; xliii, 106. ---- ----, table made from observations at Boston, Falmouth and Penobscot, xvi, 60. ---- ----, at Providence, R. I., _M. B. Lockwood_, xliv, 314. ---- ----, at Troy, N. Y., xvii, 198. ---- ----, in some parts of New York State, xxxvi, 28. ---- ----, in Connecticut, _G. Gillet_, xxiii, 205. ---- ----, at Yale College, xxx, 221. ---- ----, at Westchester, Pa., observations by _A. D. Bache_, xxvii, 385.

Magnetism, animal, v, 192; xiii, 175. ----, _Davis's_ Manual of, xliii, 381. ---- of the earth, especially of the arctic regions, _E. Sabine_, xvii, 145.^f ---- ----, causes of, _B. F. Joslin_, xix, 398. ---- ----, views of _J. Hamilton_, xxxvii, 100. ---- ----, views of _S. L. Metcalf_, xxvii, 153. ---- ----, views of _Rowall_, xli, 41. ---- ----, effect of, on the precipitation of silver, xvi, 262. ---- chemical effects of, viii, 374. ----, supposed influence of, in combinations and crystallizations, by _O. L. Erdmann_, xviii, 395. ----, influence of, xvi, 262. ----, connexion of, with electricity, iii, 386.^f ----, connexion of, with heat and electricity, _J. F. Dana_, vi, 163. ----, ----, with light, _G. Gibbs_, i, 89. ----, ----, with geology, _J. Locke_, xlvii, 101. ----, conversion of, into electricity, xxii, 386. ----, currents and sparks of electricity from, _J. Henry_, xxii, 403. ----, destroyed by lightning, xii, 382. ----, Gauss's theory of, tested by observations, _E. Loomis_, xlvii, 278. ----, _Hansteen's_ discovery in, v, 190. ----, influence of heat on, xxii, 361. ---- of soft iron, acquired by induction, retained for some time if the armature is not removed, xxviii, 63. ----, molecular forces, on the disturbance of, by, _C. G. Page_, xxxiii, 118. ---- produced by friction, xix, 394. ---- ---- by a stroke of lightning, vi, 394. ---- ---- by voltaic electricity, iii, 383. ---- ---- by the solar rays, xiii, 171. ----, double helix for inducing, _C. G. Page_, xxxv, 261.^f

Magnetization, some phenomena of, _De Nairac_, xxvii, 401.^f

Magneto-electric apparatus, and experiments, _J. P. Emmet_, xxiv, 78^f; xxvi, 311; xxviii, 331. ---- - ---- ---- ----, _J. Henry_, xxviii, 331. ---- - ---- ---- ----, _E. M. Clarke_, xxxiii, 213.^f ---- - ---- ---- ----, _C. G. Page_, xxxiv, 163^f, 364^f; xxxv, 112^f, 252^f; xxxvii, 275^f; xlviii, 392. ---- - ---- ----, _O. W. Gibbs_, xxxix, 132. ---- - ---- ---- ----, _J. H. Abbot_, xl, 104.^f ---- - ---- electrepeter, _E. M. Clarke_, xxxiii, 224.^f ---- - ---- ----, _C. G. Page_, xxxv, 112.^f ---- - ---- electrotome, _C. G. Page_, xxxv, 112^f, 253.^f ---- - ----, formula, xxxv, 356.^f ---- - ---- multiplier, _C. G. Page_, xxxvii, 275.^f ---- - ---- shock increased by a long coil, _J. Henry_, xxviii, 331. ---- - ---- ---- increased by passing it through a portion of the generating magnet, _J. P. Emmet_, xxviii, 331.

Magneto-electricity, _J. Locke_, xxxiv, 125.^f

Magnetometer, new, _A. D. Bache_, xl, 380.

Magnolia grandiflora, xxvi, 314.

Mahogany, artificial, ix, 206.

Mahomet Ali, notice of, xxviii, 30.

Maine, geological reports of _C. T. Jackson_ on, noticed, xxxii, 193; xxxv, 387; xxxvi, 143; xxxvii, 376. ----, miscellaneous remarks on the geology of, _C. T. Jackson_, xxxiv, 69; --actual bituminization of peat, xxxiv, 73. ----, anthracite coal formation of, _C. T. Jackson_, xxxvi, 149. ----, dikes of trap, and metamorphic limestone, _C. T. Jackson_, xxxvi, 145, 147. ---- iron ore veins, _C. T. Jackson_, xxxvi, 147, 150. ----, changes of level in, _C. T. Jackson_, xxxvi, 154. ----, fossiliferous rocks near Moose river, xxxvii, 378.

Maine, list of some plants in, _J. W. Bailey_, xxxii, 22. ----, minerals of Freyburg and Paris, xviii, 291.

_Mairan_, on the Aurora Borealis, allusion to, xxix, 388; xxxii, 177; xxxiv, 288, 289.

Maize, from the graves of ancient Peruvians, germination of, ix, 208. ----, sugar from, xliv, 215.

Majorca, notice of a part of, xxvii, 83.

Malachite, in Connecticut, vi, 206, 232. ----, in Massachusetts, i, 115. ----, in New York, viii, 249. ----, in Pennsylvania, i, 236. ----, of Lake Superior copper mines, vii, 45.

Malacrone, a new mineral, xlix, 394.

Malaria, remarks on, xvii, 300; xviii, 339. ----, _T. Hopkins_ on, xxxvii, 196. ---- of the Campagna di Roma, xxii, 336.

Malate of lime, in sumach, _W. B. Rogers_, xxvii, 294.

Malic acid, _J. Liebig_, xxi, 156.

Malva Lecontii, xlv, 176. ---- Nutalloides, xxvi, 313. ---- triangulata, vii, 62.

Mammalia, fossil, in Great Britain, xlvii, 186. ----, see farther under _Zoology_.

Mammoth, first use of the name, xix, 388. ----, see farther under _Zoology_. ---- Cave, Ky., alabaster (gypsum in curved forms) in, _J. Locke_, xlii, 206.^f

Mandingo, native, from near the river Gambia, account of, xxxv, 305.

Manganese, separation of, from zinc, xlvii, 194; xlviii, 187. ----, commercial value of its ores, how ascertained, _E. Turner_, xxi, 364. ----, electricity of peroxide of, xxx, 179. ----, examination of the peroxide of, _H. C. Lea_, xlii, 81. ----, two sulphates of, xvi, 383. ---- ores, analyses of, _P. Berthier_, vii, 366. ---- ores, method of assaying, xxviii, 146. ---- ----, in Connecticut, phosphate, xiii, 196. ---- ores, in Maryland, iv, 283; xxvii, 20, 33. ---- ----, in Massachusetts, ii, 374; iv, 54, 189; vii, 253; viii, 30, 233; ix, 42; xxii, 61;--siliceous, vii, 251; ix, 22; xxii, 62. ---- ----, in New York, xlvi, 28. ---- ----, in N. Carolina, v, 258. ---- ----, in Nova Scotia, xv, 157. ---- ----, in Pennsylvania, iv, 38; xiv, 4, 12. ---- ----, in Rhode Island, viii, 231; ix, 248; xl, 185; --ferro-silicate, with a figure, _C. U. Shepard_, xvii, 142.^f ---- ----, in Virginia, iii, 245.

Manilla hemp, account of, xxi, 29; xli, 200.^f

_Mantell, G. A._, museum of, xxiii, 162^f; xxviii, 194. ----, ----, specimens from, noticed, xxviii, 197. ----, _C. Lyell's_ remarks at the presentation of the Wollaston medal to, xxviii, 391. ----, presentation of a microscope to, xliii, 206. ----, description of some fossil fruits, xlv, 401. ----, discovery of the Iguanodon, xxvii, 355.^f ----, notice of molluskite, xlv, 243. ----, on the geological age of reptiles, xxi, 359. ----, on the Unionidæ of the country of the Iguanodon, xlvii, 402.^f ----, on Zoophytes, xxxiii, 329. ----, Wonders of Geology, review of, xxxiv, 387; xxxix, 1. ----, letter to _J. Deane_, xlv, 189. ----, Medals of Creation, review of, xlviii, 105.

Manufactories of Lowell, xxvii, 346. ----, limitation of the labor of children in, xii, 194.

Manures, action of, _De la Giraudieu_, xxvi, 179. ----, action of gypsum in, xxvi, 181. ----, marl for, from Chesapeake Bay, xx, 411. ----, ----, from New Jersey, _J. Pierce_, vi, 237. ----, remarks on calcareous, xxx, 138, 383. ----, use of muriate of lime for, ix, 194.

Map of Maryland, 1835, xxx, 393; xxxii, 191. ---- of mountains, iii, 364.

Maps, on contoured, _Larcom_, xlvi, 394. ----, a mode of illustrating criminal statistics by, xxxi, 379.

Mapping instrument, xx, 159.

Maranta arundinacea, v, 302.

Marble, Carrara, an altered oolite, xxx, 176. ----, and flagstones, strength of, _E. Hodgkinson_, xliv, 168. ----, durability of, as compared with granite, xv, 168. ----, in Massachusetts, white, iv, 40; viii, 14; xxii, 28. ----, ----, clouded, viii, 14. ----, ----, dove colored, viii, 14. ----, ----, elastic, of Lanesboro' and West Stockbridge, viii, 15. ----, ----, ---- and flexible, of Berkshire, Co., ix, 241. ----, ----, tortuous layers of, viii, 28. ---- in Vermont, xxxv, 390. ---- in Connecticut, ii, 141, 165, 219, 222. ---- ----, verd antique in Connecticut, ii, 165. ---- in New York, at Hudson, transition, vi, 371. ---- ----, in the Stonybrook Mts., v, 29. ---- ----, serpentine, v, 29. ----, Potomac breccia, xxvi, 221; xxvii, 22. ----, of Maryland, xxvii, 24, 27. ---- ----, white, of Hagerstown, v, 264; xxvi, 222. ---- in Kentucky, iii, 234. ---- in Missouri, iii, 23. ----, yellow, of Tabriz, xxxvii, 355.

_Marcet, F._, influence of the moon on the weather, xxvii, 192. ----, boiling point in vessels of different materials, xlvii, 190.

Mariner's compass, the invention of, _A. Humboldt_, xl, 242.

Marl, apparatus for analyzing, _W. B. Rogers_, xxvii, 299.^f ---- from Farmington, Ct., analysis of, _E. Hitchcock_, xxxvi, 176. ---- in New York, iii, 237. ---- for manure, from near the Chesapeake Bay, xx, 411. ---- of New Jersey, identical with the chalk of England, _S. G. Morton_, xxii, 90. ---- ---- ----, analysis of, xvii, 277. ---- ---- ----, on the application of, to agriculture, _J. Pierce_, vi, 237. ----, shell, in Maryland, xxvii, 3. ---- beds of Virginia, xi, 54. ---- pits, in N. Carolina, organic remains of, _H. B. Croom_, xxvii, 168. ---- from Ashley river, S. C., composition of, _J. L. Smith_, xlviii, 101. ---- ---- ---- infusorial character of, _J. W. Bailey_, xlviii, 102. ---- in Wayne Co., Ohio, xxxi, 55. ----, red calcareous, in Texas, _J. L. Riddell_, xxxvii, 211.

Marmalite, description and analysis of, _T. Nuttall_, iv, 17, 19.

_Marsh, R._, meteorological register, xlix, 212.

Marsupial fossils of the Stonesfield slate, xxvii, 412; xxxvii, 228. ---- ----, see under _Zoology_.

Martha's Vineyard, notices of geology of, vii, 240.^f ---- ----, ibid, _C. Lyell_, xlvi, 318.

_Martin, A. St._, account of the opening into his stomach, and experiments on the gastric juice of, _W. Beaumont_, xxvi, 194.

_Martin, J._, on the central forces of bodies revolving about fixed axes, xxxix, 262.^f

_Martius, C. F. P. von_, on the spiritual life of plants, xl, 170. ----, works of, noticed, xlv, 217; xlviii, 207.

Maryland, Bare Hills, near Baltimore, _H. H. Hayden_, xxiv, 349.^f ----, minerals of, _G. W. Carpenter_, xiv, 1. ----, ---- of Baltimore and Harford Cos., _P. T. Tyson_, xviii, 78. ----, chromic iron of, iv, 321; xxiv, 349, 355; xxvii, 18, 20. ----, Appalachian chain in, _W. E. A. Aikin_, xxvi, 219.^f ----, notice of the Geological Report and Map of, _J. T. Ducatel_ and _J. H. Alexander_, xxvii, 1; xxx, 393; xxxii, 191. ----, Mastodon longirostris in, xliii, 143. ----, caves in, containing saltpetre, xxvii, 33. ----, coal in, _J. T. Ducatel_ and _J. H. Alexander_, xxvii, 29. ----, ----, chemical analysis of, ibid, xxvii, 31. ----, tertiary fossils of, _I. Lea_, xxv, 422. ----, infusoria in, xlvi, 137^f; xlviii, 201, 330.^f

_Mason, E. P._, micrometric measures of eclipse of the sun, Sept. 1838, xxxv, 174. ----, on some nebulæ, xl, 37. ----, obituary notice of, xl, 407; xliii, 381.

_Mason, O._, chemical examination of the bark of the white birch, xx, 282.

Masonite, description and analysis of, _C. T. Jackson_, xl, 186. ----, composition of, xlviii, 218.