weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1895. 127 
Petrology— Continued. 
Rocks described — Continued. 
Granite- diorite, Ries, 399. 
Granulite, Kemp, 244. 
Greenstone, Winchell, N. H., 560. 
Grit, Collie, 89. 
Hornblende andeaite, Merrill, G. P., 342. 
Hornblende andesite, Turner, 475. 
Hornblende-mica-porphyrite, Turner, 475. 
Hornblende picrite, Merrill, G. P., 342. 
Hornblende syenite, Van Hise and Bay ley, 503. 
Huronite-bearing rocks, Barlow, 28. 
Hyperstbene andesite, Merrill, G. P., 342. 
Lampropbyr, Merrill, G. P., 342. 
Lampropbyre, Marsters, 315. 
Laumonite, Berkey, 44. 
Limestone, Day, 1 18. 
Limestone, Hoffman, 222. 
Limestone, Kemp, 244, 245. 
Limestone, Smytb, C. H.Jr., 444. 
Liparite, Merrill, G. P., 342. 
Malignite, Lawson, 286. 
Melapbyre, Turner, 475. 
Melilite, Lane, 282. 
Mica syenite, Merrill, G. P., 342. 
Minette, "Weed and Pirsson, 523. 
Monchiquite, Marsters, 315. 
Nepheline-syenite, Adams, 3. 
Nepheline-syenite, Cross, 102. 
Novaculite, Griswold, 178. 
Olivine diabase, Lawson, 285. 
Ophicalcite, Kemp, 244. 
Pegmatite, Williams, G. H., 541. 
Pegmatite, Winslow, 566. 
Peridotite, Turner, 475. 
Peridotite, Van Hise and Bay ley, 503. 
Peridotite var. webrlite, Merrill, G. P., 342. 
Phonolite, Cross, 102. 
Porpbyry, Rickard, 396. 
Porphyrite, Merrill, G. P., 342. 
Porpbyrite, Turner, 475. 
Porphyritic granodiorite, Turner, 475. 
Pyroxene-andesite, Turner, 475. 
Pyroxenite, Merrill, G. P., 342. 
Quartz-andesite, Turner, 475. 
Quartz keratophyre, Weidman, 528. 
Quartz-mica-diorite, Turner, 475. 
Quartzose bornblende porphyrite, Merrill, G. 
P., 342. 
Quartz-porphyr, Turner, 475. 
Quartz-porphyry, Matthew, W. D., 324. 
Quartzite, Van Hise and Bayley, 503. 
Rhyolite, Bayley, 33. 
Rhyolite, Cross, 102. 
Rhyolite, Merrill, G. P., 342. 
Rhyolite, Turner, 475. 
Sandstone, Day, 118. 
Saxonite, Merrill, G. P., 342. 
Schist, Collie, 89. 
Schist, Cross, 102. 
Schist, Kemp, 244, 245. 
Schist, Van Hise and Bayley, 503. 
Schist, andalusite and staurolitic, Hoffman, 
222. 
Sericite schist, Hoffman, 222. 
Serpentine, Lawson, 285. 
Serpentine, Smyth, C. H.Jr., 443. 
Petrology— Continued . 
Rocks described— Continued. 
Shonkinite, Weed and Pirsson, 522, 524. 
Shoshonite, Iddings, 233. 
Slate, Collie, 89. 
Slate, Van Hise and Bayley, 503. 
Soda-granite, Matthew, W. D., 324. 
Syenite (quartz syenite porphyry), Weed and 
Pirsson, 523. 
Syenite, Weed and Pirsson, 524. 
Tinguaite (pseudo-leucite sodalite tinguaite), 
Pirsson, 373. 
Tinguaite (quartz tinguaite porphyry) 
Pirsson, 373. 
Travertine, Berkey, 44. 
Troctolyte, Elftman, 129. 
Tuff, Cross, 102. 
Tuff, Lawson, 285. 
Yogoite, Weed and Pirsson, 524. 
Physiographic geology. 
Cleveland folio, Hayes, 199. 
Cuspate capes of the Carolina coast, Abbe, 1. 
Does the Delaware water gap consist of two 
river gorges?, Walter, 515. 
Economic geology of Des Moines County, 
Iowa, Keyes, 256. 
Economic geology of Lee County, Iowa, 
Keyes, 255. 
Geographic development of Crowleys Ridge, 
Marbut, 310. 
Geological reconnoissance across Idaho, Eld- 
ridge, 128. 
Geological study of the Great Lakes, Spencer, 
J. W., 453. 
Geology of Allamakee County, Iowa, Calvin, 
66. 
Geology of Cripple Creek, Colo., Cross, 102. 
Geology of Keokuk County, Iowa, Bain, 19. 
Geology of Linn County, Iowa, Norton, 357. 
Geology of Mahaska County, Iowa, Bain, 20. 
Geology of Montgomery County, Iowa, Lons- 
dale, 299. 
Geology of the Boston Basin, Crosby, 100. 
Geology of Van Buren County, Iowa, Gordon, 
169. 
Greenland expedition of 1895, Salisbury, 413. 
Knoxville folio, Keith, 242. 
Lead and zinc deposits, Missouri, Winslow, 
564. 
McMinnville folio, Hayes, 201. 
Marysville folio, California, Lindgren and 
Turner, 297. 
Meandering rivers of Wisconsin, Kiimmel, 
276. 
Note on the Florida reef, Agassiz, 4. 
Origin of the Lower Mississippi, Griswold, 
179. 
Pikeville folio, Hayes, 200. 
Public lands and their water supply, Newell, 
353. 
Reconstruction of the Antillean continent, 
Spencer, J. W., 450. 
River valleys of the Ozark plateau, Hersbey, 
207. 
Smartsville folio, California, Lindgren and 
Turner, 298. 
Stevenson folio, Hayes, 198. 
