PETROLOGY 125 



way he has studied the lavas of Mont Pelee from all points 

 of view, in order to draw general conclusions concern- 

 ing their origin. 



University Studies of Today. Paris. At the present 

 time the leading mineralogist and petrologist in France 

 is Alfred LACROIX, who succeeded DES CLOIZEAUX as pro- 

 fessor of mineralogy at the Museum d'Histoire Naturelle 

 in 1893. He has published a five- volume work on "La 

 mineral ogie de France," which is a standard treatise on 

 the optical properties and modes of occurrence of min- 

 erals; a volume on "Les enclaves des roches volcaniques;" 

 two volumes on volcanic activity at Vesuvius and Mont 

 Pelee; and numerous important studies of minerals, of 

 contact metamorphism, of descriptive petrography, and 

 of rock alteration. He offers courses of lectures on 

 mineralogy; but the student prizes especially the oppor- 

 tunity to study in his laboratories under his inspiring 

 guidance. At the same institution Stanislas MEUNIER 

 holds the chair of geology ; he is the author of an impor- 

 tant work on "Lesmethodes de synthese enmineralogie." 

 At the" University of Paris, Louis GENTIL, w r ho has 

 described petrographically certain districts in Algeria, 

 offers excellent courses in general petrography. 



At the College de France, the eminent crystallographer, 

 F. WALLERANT, is in charge of the work in mineralogy ; 

 he has published important contributions to crystal 

 theory. Here, also, is L. CAYEUX, who is an authority 

 in the relatively neglected field of the petrography of 

 sedimentary rocks; recently he has extended his studies 

 to include all types of iron ores. 



At the ficole des Mines is the well known mineralogist, 

 TERMIER, who has been a close student of individual 

 minerals and of the crystalline schists of the Alps. L. 

 DE LAUNAY offers courses at this school and also at the 



