184 Scientific Intelligence. 



arranged according to the new quantitative system, the book 

 referred to will also be of service, as in it they are arranged 

 according to the classification of Rosenbusch and thus supple- 

 ment his well-known work. The book has been made up in a 

 way that makes it very convenient for reference and its whole 

 arrangement evinces both industry and careful compiling. 



l. v. P. 



16. Beitrage zur Petrographie des westliehen Nord- Gronland ; 

 von M. Belowskt. Zeitschr. d. deutsch. Geol. Gesellsch. lviii, 

 pp. 15-90, 1905. — The material upon which this investigation 

 is based was collected and brought back by Drygalski in his 

 expedition to the west coast of Greenland in the years 1891-1893. 

 It consists chiefly of pebbles from glacial moraines. As a result 

 of the work the author concludes that northwest Greenland con- 

 sists chiefly of crystalline schists referred to the Archean and of 

 Cretaceous strata penetrated by basalt. 



The crystalline schists are gray mica and hornblende gneisses 

 with inclusions of hornblende rocks of various kinds and cut by 

 granite intrusions. All these gneisses are supposed to be of 

 eruptive origin. One of them is interesting from the fact that it 

 contains a blue alkali hornblende referred to astochite, the rock 

 thus representing among the gneisses, the alkali sei'ies of the 

 igneous families. The hornblende included masses are referred 

 to altered peridotites. 



The pebbles in the moranial material show that not only crys- 

 talline schists but rocks of higher horizons are covered by the 

 inland ice. The later eruptive rocks which break through the 

 Cretaceous are feldspar basalts. The author suggests that the 

 petrographie characters of the Greenland gneisses allies them 

 with those of the Scandinavian peninsula and that they may be 

 of the same age. l. v. p. 



17. Recherches geologiques et p'etrographiques sur les Lacco- 

 lithes Environs de Piatigorsk ( Caucase du Nord) ; par Vera de 

 Deewies. Pp. S4, 4° ; 12 figs, and 3 plates (map). Geneva, 

 1905. — On the northern outslopes of the Caucasus lies a hilly 

 area, celebrated for its mineral springs which have rendered it 

 one of the health resorts of Russia. Several small towns, whose 

 existence is largely due to the influx of patients desiring to avail 

 themselves of the curative properties of these waters, have grown 

 up in this region. The best known of these is Piatigorsk (Five 

 Hills) connected by a branch with the main railway line to 

 Vladikavkas and the Caucasus. The main topographic features 

 of the area, through which the branch line runs to Piatigorsk, 

 are a group of scattered hills which are formed by a number of 

 laccoliths intruded into the Jurassic beds. As has been fre- 

 quently found to be the case in western America they occur on 

 the outer flank of the main mountain chain, where the sediment- 

 ary strata begin to be flexed by orogenic disturbance. 



These laccoliths present every stage of erosive dissection from 

 examples, in which the covering has not only been removed but 



