Geology and Mineralogy, 461 



ical projections in many cases, a chart of the whole region 

 showing all the mineral veins is added and special ones for 

 Clausthal and Andreasberg. 



8. Mineralogie de la France et ses colonies y description 

 physique et chimique des mineraiix; etude des conditions 

 geologiques de leur gisements, par A. Lacroix ; tome deuxieme. 

 Ire partie, 352 pp.; Paris, 1896 (Baudry et Cie.). — The part now 

 published of the Mineralogy of France forms the first portion of 

 the second volume, and is largely given up to a description of the 

 feldspars, including also the zeolites and related species. The 

 special character of this admirable work has been dwelt upon in 

 the notices of the volume which have appeared earlier. The 

 author states that the work has grown on his hands and that 

 when completed it will include another volume beyond what was 

 previously promised. The minute description of the occurrence 

 of the different species which each locality considered gives the 

 work a unique character among mineralogical publications. The 

 fact that the author has himself visited the greater part of the 

 localities mentioned has enabled him not only to present many 

 new facts, but to give a detailed and thorough account of each 

 occurrence with the special geological conditions characterizing 

 it. The work is hence quite as interesting and important for the 

 geologist as the mineralogist. 



9. llie Vienna Collection of Meteorites. — The tenth volume 

 of the "Annalen des K. K. naturhistorischen Hofmuseums " con- 

 tains an exhaustive account of the collection of meteorites at 

 the Vienna Museum, prepared by Dr. Brezina, until recently the 

 Gustos. The collection is probably the largest and most richly 

 represented among those in the great museums of the world. 

 The number of separate occurrences recorded is 498, and the list 

 includes about 60 more which are not represented at Vienna. 

 Many of the specimens are of extraordinary interest and not a 

 few are entirely unique, as for example, the iron of Mazapil, 

 Mexico, and that of Cabin Creek, Arkansas, both purchased from 

 collectors in this country. 



As the result of his study of meteorites. Dr. Brezina classifies 

 them into the two grand groups, I, of the stony meteorites, and 

 II, of iron meteorites, according as to whether the silicates or the 

 metallic constituents predominate. Further, he recognizes under 

 these groups six sub-groups, with a seventh which is interme- 

 diate between them. He names them as follows: A. Achondrites, 

 including stones with but little iron and in which the chondrules 

 are essentially absent. B. Chondrites, consisting of bronzite, 

 olivine, and nickel-iron with round or polyhedral chondrules. 

 The third sub-group, C. Sideroliths, forms the transition to the 

 irons, including those in which olivine and bronzite are promi- 

 nently present and in a cross-section seem to separate the iron 

 into individual grains. Under the iron meteorites we have next 

 D. Lithosiderites, in which silicates in the form of crystalline 

 grains are imbedded in a continuous mass of iron (here fall the 



