THE NATURAL HISTORY OF IGNEOUS ROCKS. 217 



2) BERTRAND, MARCEL. Sur la distribution geographique des 

 roches eruptives en Europe. Bull. Soc. Geol. Fr. (3), vol. 

 xvi., pp. 573-617, 1888. 



3) HARKER, ALFRED. The Bala Volcanic Series of Caernarvon- 

 shire and Associated Igneous Rocks. Cambridge, 1889. 



4) IDDINGS, JOSEPH PAXSON. The Origin of Igneous Rocks. 

 Bull. Phil. Soc, Washington, vol. xii., pp. 89-214, 1892. 



5) IDDINGS, JOSEPH P. The Volcanic Rocks of the Andes. 

 Journ. of Geol, vol. i., pp. 164-175, 1893. 



6) CROSS, Whitman. The Laccolitic Mountain Groups of Colo- 

 rado, Utah and Arizona. Fourteenth Ann. Rep. U.S. Geol. 

 Surv., pp. 157-241, 1895. 



7) Backstrom, Helge. Ueber leucitfiihrende Gesteine von den 

 Liparischen Inseln. Geol. Foren. i. Stockholm Forhandl., vol. 

 xviii., pp. 155-164, 1896. 



8) Osann, A. Beitrage zur Kenntniss der Eruptivgesteine des 

 Cabo de Gata (Prov. Almeria). Zeits. dents, geol. Ges., vol. 

 xli., pp. 297-311, 1889. 



9) Lang, Otto. Die vulcanischen Herde am Golfe von Neapel. 



Ibid, vol. xlv., pp. 177-194, 1893. 



(10) Turner, H. W. The Age and Succession of the Igneous 



Rocks of the Sierra Nevada. Journ. of Geol, vol. iii., pp. 

 385-414, 1895. 



(11) BROGGER, W. C. Die Eruptivgesteine des Kristianiagebietes. 



II. Die Eruptionsfolge der triadischen Eruptivgesteine bei 

 Predazzo in Slidtyrol. Vidensk. Skrifter. I. MatJi.-naturw. 

 Klasse, No. 7, 1895. 



(12) BECKER, Geo. F. Some Queries on Rock Differentiation. 



Amer. Journ. Sci. (4), vol. iii., pp. 21-40, 1897. 



(13) Geikie, Sir ARCHIBALD. The Ancient Volcanoes of Great 



Britain, 2 vol. Roy. 8vo. London, 1897. 



(14) Daubree (A.) Experiences sur les actions mecaniques exer- 



cees sur les roches par des gaz doues d'une tres forte pression 

 et d'un mouvement rapide. Comptes Rendus, vol. cxi., pp. 

 767-774, 857-863, vol. cxii., pp. 125-136, 1434-1490, 1890-91. 

 Recherches experimentales sur le role possible des gaz a 

 hautes temperatures, doues de tres fortes pressions et animes 

 d'un mouvement fort rapide, dans divers phenomenes 

 gdologiques. Bull. Soc. Geol. Fr., ser. 3, vol. xix., pp. 313- 



354- 



(15) RUSSELL, Israel C. Igneous Intrusions in the Neighbour- 



hood of the Black Hills of Dakota. Journ. of Geol., vol. iv., 

 pp. 23-43, 1896. On the Nature of Igneous Intrusions. 

 Ibid. pp. 177-194, 1896. 



