_Silliman, B., Jr._, on the electrotype, xl, 157.^f ----, analysis of the alluvium of the Nile, xl, 190. ----, rhombic structure of Connecticut sandstone, xli, 173. ----, soil of the Nile, xli, 160. ----, a daguerrotype experiment by galvanic light, xliii, 185. ----, use of carbon in Grove's battery, xliii, 393. ----, account of a carbon battery, xliv, 180.^f ----, scratches on rocks of Connecticut, xlv, 333. ----, review of Dana's Mineralogy, xlvi, 362.^f ----, analysis of Haydenite, xlvi, 379. ----, on meteoric iron from Otsego Co., N. Y., xlvi, 401. ----, on the trap and sandstone of Connecticut, xlvii, 107. ----, natural polariscope, xlvii, 418. ----, analysis of waters of the Dead Sea, xlviii, 10. ----, analysis of the mud of New Haven harbor, xlviii, 337. ----, reply to C. U. Shepard on a notice of his Mineralogy, xlviii, 179. ----, notice of meteoric iron from Cambria, near Lockport, N. Y., xlviii, 388.^f _Silliman, B. D._, experiments on topaz, x, 352. ----, notice of an Aurora, xiv, 91. Sillimanite, named, described and analyzed by _G. T. Bowen_, viii, 113. ----, notice of, viii, 195. ----, compared crystallographically with Kyanite, _C. U. Shepard_, xii, 59.^f ----, crystal of, with analyses, xlvi, 381.^f ----, analysis of, xlviii, 219. ----, analysis by _T. Thomson_, xlix, 396. ----, locality of, and of monazite, in Westchester Co., N. Y., xlvi, 207. Silphium, v, 301. Silurian or transition system, xxxv, 243. ---- ---- ----, _R. I. Murchison_ on, noticed, xxxvi, 399; xxxvii, 219; xliv, 193. ---- system of England and Europe, xxxvii, 219. ---- rocks of Denbigshire, _J. E. Bowman_, xlii, 325. ---- ---- of New York, xl, 77. ---- system, and its characteristic fossils, _T. A. Conrad_, xxxviii, 86. ---- ----, ibid, _H. D. Rogers_, xlvii, 145. ---- fossils, in Indiana, xlvi, 296.