WEEKS.] 
PETROLOGY, AND MINERALOGY FOR 1892-1900. 
303 
Petrology— Continued. 
Massachust tts—i !ontinued. 
Biotite-tinguaite, dike, Eakle, 1587. 
Biotite-tinguaite dike rock, Sears, 4904b. 
Diabase pitchstone and mud inelosures in 
Triassic trap, Emerson, 1674. 
Disintegration and decomposition of diabase, 
Merrill, 3954. 
Eruptive dike near Manchester, Pearce, 4269. 
Geological and mineralogical notes, Sears, 
4903. 
Geology of Boston Basin, Crosby, 1152,1157. 
1178. 
Geology of eastern Berkshire County, Emer- 
son, 1678. 
Geology of Old Hampshire County, Massa- 
chusetts, Emerson, 1677. 
Geology of Wachusett dam and tunnel, 
Crosby, 1169. 
Mineralogy and geology of Essex County, 
Massachusetts Sears 1904a. 
Mount Greylock, Dale, 1254. 
Newer eruptive rocks, Merrill, 3946. 
Occurrence of duiiite, Martin, 3730. 
Petrographic province of Essex County. Wash- 
ington, 5873, 5874, 5875, 5876, - r >877. 
Petrography of Boston basin, White. 6068. 
Petrography, vicinity of boston. Wolff, 6410. 
Schists, metamorphism of, Bobbs, 2634. 
Structure of Monument Mountain, Dale, 1253. 
Volcanics of Neponsel Valley, Bascom, 288. 
Mexico. 
Descripcion de las rocas, onion./. 1144. 
El Real del Monte, Ordonez and Rangel, 1152. 
Eruptive rocks of Mexico. Far ring ton, 1799. 
Free gold in granite, Merrill, 3956. 
Geologia de la sierra <le Pachuca, Aguilera 
and onlonez. 63. 
Geologia de los Alrededores de < Orizaba, Bose, 
507. 
Igneous rocks from Coahui la and Nueva Leon, 
Cross, 1185. 
[tinerarios geologicos, Aguilera, 60. 
Itinerarios geologicos, Ordonez, n 12. 
Las rocas eruptives del Suroeste, Ordonez, 
4141. 
Les filons argentiferes de Pachuca, Ordonez, 
4149. 
Observations on Popocatepetl, Farrington, 
1796. 
Rocas erupt ivas, Ordonez, 4143. 
Sinopsis de geologia Mexicana, Aguilera, 61. 
Michigan; 
basic massive rocks of Lake Superior region, 
Bayley, 308. 
Crystal Falls iron-bearing district, Clements 
and Smyth, 1017. 
Felsites and associated rocks, Hubbard, 2798. 
Iron-bearing series, Irving and Van Ilise, 2869. 
Marquette district, Van Hiseand Bayley, 5704. 
Marquette iron district. Michigan, Van Hise 
and Bayley, 5696. 
Microscopic study of Michigan rocks, Pat ton, 
4256. 
Quartzite tongue at Republic, Smyth, H. L., 
5099. 
Report on Isle Royale, Lane, 3393. 
Rock variation, Clements, 1015. 
Petrology— Continued. 
Michigan — Continued. 
Rocks and minerals from Michigan, Lane, 
3382. 
Upper Peninsula of Michigan, Rominger, 4664. 
Volcanics of the Michigamme district, Mich- 
igan, Clements, 1013. 
Minnesota. 
Actinolite magnetite schists, Bayley, 307. 
Akeley Lake region, Bayley, 302. 
Anorthosites of Lake Superior, Lawson, 3408. 
Augite and plagioclase, fibrous intergrowth 
of, Bayley, 303. 
Basic massive rocks of Lake Superior region. 
Bayley. 308,310. 
Basic rocks of the Lake Superior region, bay- 
ley. 312. 
Contact metamorphism of a basic igneous 
rock. Grant, 2149. 
Dikes containing huronite, Barlow, 'J4.">. 
Eruptive debris at Taylor Falls. Winchell, 
6342. 
Field work in Minnesota, Elftman, 1633. 
Gabbroid rocks of Minnesota, Winchell, 6277. 
Geologic structure of Vermilion range, Smyth 
and Finlay, 5102. 
Geology of Bibbing plate, Winchell, 6353. 
Geology of ftasca County, culver. 1214. 
Geology of Kekequabic bake. Grant, 2109. 
Geology of Keweenawan area, Elftman, 1635. 
Geology of Mesabi Range, Grant, 2123. 
Geology of St. Croix Dalles, Berkey, 427. 
Gneisses, gabbro-schists, and associated rocks, 
Hall, 2251. 
Iron-bearing rocks of the Mesabi range, Spurr, 
5166. 
K thiching granite, Winchell. tii'TH. 
Laccolitic sills, Lawson, 3409. 
Lis1 of rock samples with annotations, Win- 
chell, 6372. 
Mineral alterations in the granitic rocks of 
the Northwestern States, Hall, 2248. 
Mineralogy and petrology of Minnesota, Win- 
chell, 6373. 
Minnesota minerals, Berkey, 125. 
Petrographic geology of the crystalline rocks 
of Minnesota, Winchell and Grant, 6376. 
Pigeon Point, rocks of, Bayley, 309. 
Report of field work, Elftman, 1637. 
Sioux quartzite, Beyer, 433. 
Soda-granite, augite. Grant, 2104. 
Stillwater dee]) Well. Meeds, 3896. 
Structural geology, Winchell, 6372. 
Structure of gabbro and on troctolyte, Elft- 
man, 1634. 
Structure of the Keweenawan, Winchell. 6374. 
Volcanic ash from north shore of Lake Supe- 
rior, Winchell and Grant, 6324. 
Volcanic rocks in the Keewatin, Grant, 2111. 
Missouri. 
Cherts of Missouri, Hovey, 2764, 
Crystalline rocks of Missouri, Haworth, 2342, 
2357. 
Geology of the Missouri crystalline area, 
Keyes, 3086. 
Granite rocks of Missouri, Keyes, 3084. 
Granites and porphyries of the Ozarks, Keyes, 
