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PENA, M., 4. Los criaderos cle Fluorite en Santa Cruz, Magdalena, Sonora, 



Bol. Min. Mexico, v. pp. 577-579. 1918. 

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bdeno y Grafito, por la Aduana de Nogales, Sonora. Ibid. v. pp. 587- 



590. 1918. 



6. Informe acerea de la visita de inspeccion practicada a las minas de 



la Negociacion Minera " El Alamo " de Ensenada, B.C. Ibid. vii. pp. 



8-15, pi. [mine-plan]. 1919. 

 PENCE, A. See Holland, Sib T. H., 3; & Mawson, Sir D., 4. 

 PENGELLY, W. Biogr.—See Julian, Mrs. H. T., 1 db 2. 

 PEXHALLOW, D. P. A Report on Fossil Plants from the International 



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Dep. Mines, Geol. Surv., Mem. no. 38, pp. 800-840, figs. & pis. i-ix. 1912. 

 PENNY, F. W. The Ore Veins of the Fundkofel Gold Mine near Ober- 



drauberg in Carinthia, Trans. Inst. Min. db Metall. xxiii. pp. 490- 



501, figs. [geol. sections] & pis. xli-xliii. 1914. 

 PENROSE, R, A. F., fd. The Pitchblende of Cornwall, England. Econ. 



Geol. x. pp. 161-171. 1915. 

 2. Amos Peaslee Brown. [Obit.] Bull. Geol. Soc. Am. xxix. pp. 13- 



17, pi. i [portrait]. 1918. 

 PENZER, N. M. The Minerals of Anatolia. Mining Mag. xxi. pp. 76-81, 



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 PERCTVAL, F. G. On the Punctation oAhe Shells of Terebratv.la. Geol. 



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PEREIRA-FORJAZ, A. Etudes spectrographiques des mineraux portugais 

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PERINGUEY, L. Palajothic Man in South Africa. Nature, xcvi. p. 1 14. 1915. 

 ■ 2. Presidential Address to the Royal Society of South Africa, 1915. 



The Bushman as a Palaeolithic Man. Trans. Boy. Soc. S. Afr. v. pp. 



225-236. 1915. 



. See also Haughton, S. H., 4; db South Africa, 5-8. 



PER KIN, F. M. A New British Oil Industry.— II. Coll. Guard, cxv. pp. 



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2. Production of Oil from Mineral Sources. Ibid. cxvi. p. 1349. 1918. 



PER KIN, W. H. Presidential Address, Chemical Society, 1915. The 



Position of the Organic Chemical Industry. Trans. Chem. Soc. cvii. pp. 



557-578. 1915. A.C. 

 PERKINS, G. H. Henry Martyn Seely. [Obit.] Bull. Geol. Soc. Am. 



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 PERKINS, P. B. Radioactivity of Underground Waters in Providence and 



the Vicinity. Science, xlii. pp. 806-808, figs. 1915. 

 PERKINS, W. T. The Channel Tunnel. Pp. 1-136, figs. [maps]. 4to. 



London, 1913. A.C. 

 PERKKENOJA, Y. J. Toriseva-jarvet, Meddel. geogr. Foren. Finland, 



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 PEROCHE, J. Obit.— See Gosselet, J., 4. 



PEROLD, A. I., & D. C. Crawford. Some Preliminary Investigations into 



the Chemical Composition of Certain Vineyard Soils in the Montagu and 



Robertson Districts. S. Afr. Journ. Sci. xi. pp. 337-349. 1915." 

 PERRET, F. A. The Lava Eruption of Stromboli, Summer-Autumn, 



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 PERRIPJR, C. Sopra alcuni crtitalli di gesso art ificiale. Atti B. Acc. 



Lincei, ser. 5, Rendic. xxiv. sem. 1, pp. 159-163, fig. 1915. 

 2. Sullo zolfo di Zdnda (S. Juan) (Repubblica Argentina). Ibid. pp. 



622-625, fig. 1915. 

 PERRIER, E. Gaston Vasseur. [Obit.] C. B. Acad. Sci., Paris, clxi. 



pp. 449-451. 1915. 



2. ' Charles Rene Zeilleu. [Obit.] Ibid. clxi. pp. 657-660. 1915. 



3. Sir William Ramsay. [Obit,] Ibid, clxiii. pp. 113-116. 1916. 



PERR Y, E. H., & A. Locke. Interpretation of Assay Curves for Drill Holes. 



Trans. Am. Inst. M. E. liv. pp. 93-99, figs, [diagrams]. 1917. 

 PERRY, J., & Others. Seismological Investigations. — Nineteenth Report 



of the Committee. Rep. Brit. Assoc. 1914, pp. 41-69, pi. 1 [map]. 1915. 

 2. . . Twentieth Report of the Committee. Ibid. 



1915, pp. 52-79, figs. & pis. i-iv [diagramsj. 1916. 



