PETROGRAPHY. 343 



Teall, J. J. H. Ou the oiigiu of certain banded Gueisses. Geol. Mag., November, 

 1887, p. 484. 



Couteud.s that the gneissic rocks of the Lizard District (the grauulitic series of 

 Professor Boniiey) are of igneous origin, and owe their banded structure to dy- 

 namic agencies. 



(d) llELATING TO METHODS Ol' WORK. 



Becke, F. Unterscheiduug von Quarz and Feldspath in DUnnschliften niittelsfc Far- 

 bung. Min. und pet. Mitthcilungen, Zehnter Band, i. Heft, 1888, p. 90. 



Treats the uncovered section with hydrofluoric acid. Quartz isdissolved, while 

 the feklsparis converted into an amorphous Unosilicate of alumina. This, when 

 treated with aniline, absorbs the color, while the quartz remains clear. 



McMahon, C. a. Ou a mode of using the Quartz-Wedge for estimating the strength 

 of the Double Refraction of Minerals in thin slices of rock. Geol. Mag., Decem- 

 ber, 1888, p. r)48. 



Smeeth, W. F. Apparatus for separating the mineral constituents of rocks. Sci. 

 Proc. Roy. Dub. Soe., May, 1888, vol. vi, pp. .''18-00. 



On a method of determining the specific gravity of substances in the form 



of powder. Sci. Proc. Roy. Dub. Soc, May, 1888, vol. vi, p. 61. 



Strrng, a. Ueber einige mikrospisch-chemischo Reaktiouen. Neues Jahrb. Min., 

 Geol., etc., 1888, ii. Band., 2. Heft, p. 142. 



(e) MISCELLANEOUS. 



Adams, Frank, and A. C. Lawson. On some Canadian Rocks containing acapolite, 

 with a few notes on Rocks associated with the Apatite Deposits. Canadian Rec- 

 ord of Sci., No. 4, 1888, vol. ill, pp. 186-201. 



AuGE, M. Note snr la Bauxite, son origine, son Ago et son importance gdologique. 

 Bull. Soc. G<5ol. de France, 1888, 3d series, vol. xvi, p. :545, No. 5. 



Bailey, W. S. Notes on the microscopical examinations of rocks from the Thunder 

 Bay Silver District. Rep. Geol. and Nat. Hist. Survey of Canada, 1887, Appendix 

 I, pp. 115 H to 12-2 H. 



Summary of Progress in Mineralogy and Petrography in 1887. From monthly 



notes in the American Naturalist. 



Sununary of Progress in Mineralogy and Petrography in 1888. From monthly 



notes in the Am. Naturalist. 



These summaries are issued by Mr. Bailey in jiamphlet format the end of each 

 year ; they consist of the same notes published by him monthly in the American 

 Naturalist, and form a very essential part of the literature to those not having 

 access to many of the periodicals and other publications. 



On some peculiarly spotted rocks from Pigeon Cove, Minnesota. Am. Jour. 



Sci., May, 1888, pp. 388-393. 



Bertrand, Marcel. Sur la distribution geographiqne des roches ernptives en En- 

 rope. Bull. Soc. Geol. de France, 1888, 3d series, vol. xvi. No. 7, p. 573. 



Beyer, Otto. Der Basalt des Grossdehsaer Berges nud seine Einschliisso sowie 

 iihnliche vorkommnisse ans der Oberlansitz. Min. und pet. Mittheilungeu, x. 

 Band, i. Heft, p. 1. One plate with eight figures showing micro-structures. 



Blake, J. F. On the occnnence of Glaucopliane-bearing Rock in Anglesey. Geol. 

 Mag., March, 1888, p. 125. 



On the Monian System of Rocks. Qnar. Jour. Geol. Soc, No. 175, August, 



1888, vol. xliv. p. 463. 



BoNXEV, T. G. The foundation stones of tlie earth's crust. Nature, November 22, 

 1888, p. 89. 



Note on the structure of the Ightham Stone. Geol. Mag., July, 1888, p. 297. 



Notes on a part of the Huroniau series in the neighborhood of Sudbury (Can- 

 ada). Qnar. Jour. Geol. Soc, No. 173, February, 1888, vol. xliv, p. 32. 



