Reviews — Delesse et De Lapparent, Revue de Geolog'ie. 517 



therefore very acceptable, especially when the materials are carefully 

 collated and judiciously arranged. The " Eevue de Geologic," under 

 the able editorship of MM. Delesse et De Lapparent, which now 

 extends to six volumes, must always be a valuable addition to the 

 library of the geologist, inasmuch as it not only gives abstracts of 

 the more important papers, but also references to the periodicals 

 in which they appear. The present volume comprises the report of 

 the principal works which have been published for the years 1866- 

 67, besides which it contains some unpublished papers which have 

 been communicated directly to the Editors, as well as an account of 

 the mineral substances in the French Exposition of 1867, capable of 

 being usefully employed. The subjects are treated in a similar 

 manner to that adopted in the preceding volume, under four heads — 

 Preliminary Observations, Eocks, Strata, Terrans, and Geological De- 

 scriptions. The first part includes notices of the general works on 

 geology, the agencies at present in operation, as atmospheric, glacial, 

 lacustrine, and marine, followed by articles on subterranean and 

 mineral waters, oscillation of coasts and volcanic phenomena, and the 

 connection between mineral springs and the deposits of petroleum 

 with the dislocations of strata. The most productive oil region of 

 eastern Virginia is comprised in a zone of elevation which extends 

 from the burning springs to the Ohio, a distance of nearly sixty 

 kilometres. The second part treats of lithology, including the 

 general properties, and the classification of rocks, followed by special 

 notices on the composition of the rocks themselves. This part occu- 

 pies more than one hundred pages of the volume, including the 

 Carbonaceous, Calcareous, Siliceous, Argillaceous, Magnesian, Fels- 

 pathic, and Metalliferous rocks of different countries ; together with 

 the formation of minerals, rocks, and stony cements, and also the 

 modifications which rocks have undergone by special and general 

 metamorphism. Among these articles we notice the analysis of the 

 principal marbles of the Jura, by C. Mene, the most remarkable of 

 which is that of Crans, distinguished by its fine yellow colour, inter- 

 spersed with parallel veins and knots resembling ash wood. Other 

 remarkable marbles, briefly alluded to here, but more fully treated of 

 in M. Delesse's interesting work on the materials for construction in 

 the Universal Exposition of 1867, are those of Italy, Greece, Livonia, 

 Portugal, Silesia, Westphalia, Spain, Austria, Canada, and the United 

 States. The third part contains the classification of the stratified 

 rocks and their fossils of different countries, aiTanged in chrono- 

 logical order. This includes references to a series of memoirs of 

 great use to the geologist, followed as it is by references to some 

 special palfeontological papers. The last part comprises geological 

 descriptions of difierent countries, either containing notices of special 

 local geology, or memoirs on general geology, amongst which may 

 be mentioned the studies of MM. Boisse and Vene on the geology of 

 the departments of Aveyron and the Ande, as well as some notes by 

 M. de Mortillet on Italian geology, by M. Dewalque on Belgium, 

 by M. L. Yille on Algeria, and M. Gamier on New Caledonia ; be- 

 sides which, as in preceding years, the principal sinkings or borings 



