DiiTON.j 



NORTH AMEUrCAN UEOLOGY. 



1017 



Williatos, C.P., andBlandy, J.r. Some 

 contributions to a knowledge of the 

 constitution of the copper ranges of 

 Lake Superior. 



Am. Jour. Sci., 2d series, vol. 34, pp. H2-120, 

 1862. 



Williams [E. H. J.]. A manual of lith- 

 ology, 8, 135 pages, 24°, New York, 1886. 



Williams, Frederick W. The loess de- 

 posits of northern China. 



Popular Sci. Monthly, vol. 24, pp. 243-248, 

 1884. 



'VVilliams, George H. On the paramor- 

 phosis of pyroxene to hornblende in 

 rocks. 



Am. Jour. Sci., 3d series, vol. 28, pp. 259-268, 

 1884. 



Preliminary notice of the gabbros 



and associated hornblende rooks in the 

 vicinity of Baltimore. 



Johns Hopkins TlniT., Circular, No. 30, vol. 

 3, pp. 79-80, 1884. 



Note on so-called quartz porphyry 



at HoUins Station north of Baltimore. 

 Johns Hopkins Univ., Circular, No. 32, vol. 



3, p. 131 (i p.), 1884. 



The microscope in geology. 



Science, vol. 5, pp. 190-191, 1885. 



Notice of an important work on the 



origin of the crystalline schists, by J. 

 • Lehmann, professor of geology at Bres- 

 lau, illustrated by an atlas of 28 photo- 

 graphic plates, 4°, Bonn, 1884, [Ab- 

 stract.] 



Am. Assoc. Adv. Sci.,Proc., vol. 33,pp. 405- 

 407, 1S85. 

 Abstract, Science, vol. 4, p. 327 (J p.), 1884. 



Dikes of apparently eruptive granite 



in the neighborhood of Baltimore. 



Johns Hopkins Univ., Circular, No. 38, vol. 



4, pp. 65-66, 1885. 



Metamorphosis of gabbro. 



Am. Nat., vol. 19, pp. 992-993 (| p.), 1885. 



[ ] Hypersthene-basalt. 



Am. Nat., vol. 19, p. 601 (J p.), 1885. 

 Mineralogy and petrography. [Ab- 

 stracts, with comments on recent 

 papers.] 



Am. Nat., vol. 19, pp. 991-994, 1885. 



The peridotites of the "Cortland 



series" on the Hudson River near 

 Peekskill, N. Y. 



Am. Jour. Sci., 3d series, vol. 31, pp. 26-41, 

 1886. 

 Abstract, Am. Nat., vol. 20, p. 275 (i p.), 1886. 



Williams, George H. — Continued. 



Modern petrography, an account of 



the application of the microscope to 

 the study of geology, 35, 120 pages, 

 Boston, 1886. 



The gabbros and associated horn- 

 blende rocks occurring in the neighbor- 

 hood of Baltimore, Md. 



U. S. aeol. Surv., Bnll., vol. 4, No. 28, pp. 613- 

 688, plates, 'Washington, 1886. 



Abstracts, Geol. Mag., 3d series, vol. 4, pp. 

 87-88, 1887; Am. Nat., vol. 20, pp. 1049-1050 

 (J p.), 1886. 



Eutil nach Ilmenit in verandertem 



Diabas. Pleonast (Hercynit) in Norit 

 vom Hudson-Fluss. Perowskit in Ser- 

 pentin (Peridotit) von Syracuse, N. Y. 

 Neues Jahrbuch, 1887, vol. 2, pp. 263-267, 

 1887. 



On a plan proposed for future work 



upon the geological map of the Balti- 

 more region. 



Johns Hopkins Univ., Circular, No. 59, pp. 

 122-123, 1887. 



The norites of the " Cortland se- 

 ries " on the Hudson Eiver, near Peeks- 

 kill, N. Y. 



Am. Jour. Sci., 3d series, vol. 33, pp. 135-144, 

 191-199, 1887. 



Abstract, Neues Jahrbuch, 1887, vol. 2, pp. 

 316-317. 



Holocrystalline granitic structure in 



eruptive rocks of Tertiary age. 



Am. Jour. Sci., 3d series, vol. 33, pp. 315-316, 

 1887. 



On the serpentine (peridotite) occur- 

 ring in the Onondaga salt group at 

 Syracuse, N. Y. 



Am. Jour. Sci., 3d series, vol. 34, pp. 137-145, 

 1887. 



Abstract, by author. Science, vol, 9, pp. 232- 

 233. 



Abstract, by author, Neues Jahrbuch, 1888, 

 vol. 1, pp. 80-81. 



Some examples of the dynamic meta- 



morphism of the ancient eruptive rocks 

 on the south shore of Lake Superior. 

 [Abstract.] 



Am. Assoc. Adv. Sci., Proc, vol. 36, pp. 225- 

 226,1888. 



The gabbros and diorites of the 



"Cortland series" on the Hudson 

 Eiver, near Peekskill, N. Y. 



Am. Jour. Sci., 3d series, vol. 35, pp. 438-448, 

 1888. 

 Abstract, Am. Nat., vol. 22; p. 929 (J p.) ; 1888. 



