weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1898. 157 
Petrology— Continued. 
Central — Continued. 
Educational series of rock specimens, Diller, 
No. 234. 
Geological history of Panama and Costa Rica, 
Hill, No. 352. 
Igneous rocks from Panama and Costa Rica, 
Wolff, No. 928. 
Magmatic differentiation in rocks of copper- 
bearing series, Lane, No. 475. 
Methods of determining character of mineral 
plates, Wadsworth, No. 840. 
Oldest known rock, Winchell, No. 924. 
Origin of novaculites, Branner, No. 97. 
Rock classification, Iddings, No. 383. 
Rocks of Laurentian system, Adams, No. 2. 
Study of natural palimpsests, Grimsley, No. 
319. 
Variation in composition of igneous rocks, 
Walker, No. 846. 
Zirkelite, Wadsworth, No. 841. 
Alaska. 
Gold fields of southern Alaska, Becker, No. 56. 
Arkansas. 
Origin of certain siliceous rocks, Derby, No. 
233. 
California. 
Bid well Bar folio, Turner, No. 776. 
Geology of southern coast ranges, Fairbanks, 
No. 262. 
Lava flows of Sierra Nevada, Ransome, No. 
648. 
Rocks and minerals from California, Turner, 
No. 778. 
Rocks of coast ranges, Turner, No. 777. 
San Clemente Island, Smith, No. 714. 
Canada. 
Basic dikes and volcanic rocks, Miller, No. 
564. 
Geology of French River sheet, Bell, No. 68. 
Granites and arkoses, Barlow and Forrier, 
No. 50. 
Nodular granite, Adams, No. 3. 
Colorado. 
Geology of Aspen mining district, Spurr, No. 
739a. 
Granite breccias of Cripple Creek, Stone, No. 
751. 
Tenmile folio, Emmons, No. 259. 
Connecticut. 
Triassic formation of Connecticut, Davis, No. 
199. 
Georgia. 
Metamorphic rocks around Dahlonega, Wat- 
son, No. 852. 
Hawaiian Islands. 
Lavas and soils, Maxwell, No. 539. 
Idaho. 
Boise folio, Lindgren, No. 492. 
Indian Territory. 
Coal fields of Indian Territory, Drake, No. 
239. 
Maine. 
Dikes in vicinity of Portland, Lord, No. 499. 
Massachusetts. 
Acid pegmatite in diabase, Jaggar, No. 392% 
Petrology —Continued. 
Massachusetts — Continued. 
Biotite-tinguaite, dike, Eakle, No. 244. 
Occurrence of dunite, Martin, No. 530. 
Petrographic province of Essex County, 
Washington, No. 851. 
Petrography, vicinity of Boston, Wolff, No. 
926. 
Mexico. 
Les filons argentiferes de Pachuca, Ordonez, 
No. 582. 
Michigan. 
Rock variation, Clements, No. 159. 
Minnesota. 
Eruptive debris at Taylor Falls, Wincbell, 
No. 919. 
Geology of Keweenawan area, Elftman, No. 
250. 
Geology of Mesabi Range, Grant, No. 314. 
Montana. 
Geology of Helena, Griswold, No. 321. 
New Jersey. 
Age of Frankling white limestone, Wolff and 
Brooks, No. 931. 
New Mexico. 
Geology of Albuquerque, Herrick, No. 340. 
Geology of New Mexico, Herrick, No. 342. 
New York. 
Contact metamorphism of diabase, Irving, 
No. 390. 
Crystalline rocks of St. Lawrence County, 
Smyth, No. 718. 
Geology of Essex County, Kemp, No. 405. 
Geology of Lake Placid region, Kemp, No. 406. 
Geology of Orange County, Ries, No. 658. 
Magnetite area near Port Henry, Kemp, No. 
403. 
Origin of serpentines, Merrill, No. 549. 
Syenite-porphyry dikes, Cushing, No. 181. 
Weathering in alnoite, Smyth, No. 720. 
North Carolina. 
Origin of corundum, Pratt, No. 635. 
Oregon. 
Roseburg folio, Diller, No. 235. 
Pennsylvania. 
Birdsboro trap quarries, Rand, No. 647. 
Feldspars in serpentine, Hopkins, No. 376. 
Volcanic rocks of Mesozoic age, Goldsmith, 
No. 302. 
Utah. 
Igneous phenomena in Tintic Mountains, 
Smith, No. 710. 
Virginia. 
Felsophyre and basalt in Paleozoic rocks, 
Darton and Keith, No. 198. 
Weathering of diabase, Watson, No. 853. 
Washington. 
Rocks of Mount Rainier, Smith, No. 709. 
Wisconsin. 
Geology of St. Croix Dalles, Berkey, No. 73. 
Pre-Cambrian igneous rocks, Weidman, No. 
857a. 
Rocks described. 
Akerite, Washington, No. 851. 
Albite-schist, Diller, No. 234. 
Alnoite, Smyth, No. 720. 
