SOME METASOMATIC CHANGES IN LIMESTONES. 61 



placement of limestones in some areas by ores of manganese > 

 zinc, etc., must also be left to a future occasion. 



BIBLIOGRAPHY. 



(i) Hopkins, T. C. Marbles and other Limestones. Vol. iv. 

 of Ann. Rep. of Geo/. Surv. Arkansas for 1890; Little Rock,. 

 1893. 



(2) Retgers, J. W. Ueber den Isomorphismus in der Dolom- 



itreihe. Neu. Jahrb. fiir Mm., 1891, vol. i., pp. 132-160. 

 Zur Isomorphiefrage in der Dolomitreihe. Ibid., 1892, vol. 

 i., pp. 212-217. 



(3) BENTIVOGLIO, T. Ricerche sulla dolomite. Atti delta Soc. 



di Natural, di Modena (3), vol. xi. 



(4) VON WOEHRMANN [S.]. Alpine und ausseralpine Trias. 



Neu. Jahrb. fiir Min., 1894, vol. i., pp. 1-50. 



(5) HOEGBOM, A. G. Ueber Dolomitbildung und Dolomitische 



Kalkorganismen. Ibid., pp. 262-274. 



(6) Klement, C. Sur l'Origine de la Dolomie dans les forma- 



tions sedimentaires. Mem. Soc. Beige de Geol., vol. ix., pp. 



3-23, 1895. 



(7) Nason, Frank N. The Chemical Composition of some of 



the White Limestones of Sussex County, N.J. Amer. Geol, 

 vol. xiii., pp. 154-164, 1894. Summary of Facts proving the 

 Cambrian Age of the White Limestones of Sussex County, 

 New Jersey. Ibid., vol. xiv., pp. 161-168, 1894. 



(8) GARWOOD, E. J. On the Origin and Mode of Formation of 



the Concretions in the Magnesian Limestones of Durham. 

 Geol. Mag., 1 891, pp. 433-440. 



(9) Kimball, James P. Genesis of Iron-ores by Isomorphous and 



Pseudomorphous Replacement of Limestone, etc. Amer. 



Journ. Sei. (3), vol. xlii., pp. 231-241, 1891. 

 (10) LOTTI, B. Ueber die Entstehung der Eisenlagerstatten der 



Insel Elba und der toscanischen Kustenregion. Geol. Fbren. 



Stockholm Fork., vol. xiii., pp. 599-603, 1891. 

 (n) FOERSTE, Aug. F. On the Clinton Oolitic Iron-ores. Amer. 



Journ. Sei. (3), vol. xli., pp. 28, 29, 1891. 



(12) Smyth, C. FL, Jr. On the Clinton Iron-ore. Ibid., vol. xliii.,, 



pp. 487-496, 1892. 



(13) Smyth, C. H., Jr. Die Hamatite von Clinton in den ostlichen 



Vereinigten Staaten. Zeits. fiir prakt. Geol., vol. ii., pp. 

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(14) Bleicher. Sur la structure microscopique du mineral de 



fer oolithique de Lorraine. Comptes Rendus, vol. cxiv., pp. 



590-593, 1892. 



Alfred Harker. 



