Geology and Mineralogy. 315 



rock at 13^ feet to the ton would weigh 10,903,552,000 tons, so 

 that to cover the whole surface of the globe one mile deep with 

 sediment from the land at the rate of 800 tons per square mile of 

 land surface, would take 52,647,052 year*, or .~o; million years in 

 round numbers for ten miles doe])/' 



5. 77ie Carf>i> Ji ;j\,;,u_s and Permian a rimtinaot/s f<a*>natii>n 

 in Bulimia. — A paper full of details as to fossils is published by 

 Dr. Feistmantel in th< for March, in which 



the author proves that " in Bohemia (certainly also in other local- 

 ities) there is no strict boundary between the Carboniferous and 

 Permian ; on the contrary, that these formations are in very close 

 connection, as is shown in the association of a flora of Carbonifer- 

 ous ehar:i. ■ . , ,; \\ rmiaii character, in the Gas- 

 ■■"!-■ ■!' th. 1'i M-n and Kludno-liakonitz basins." In the Pilsen 

 '" i hasin tin _, ix , , o , ,, i in- tin I'm nan im d ! issils, Xe/<o- 

 canthus Decheni, "one of the best Permian species," an Acanthodes 

 near A. gracilis Worn., a Paimoniscus, Uronectes (Gampsoin/x) 

 and other species ; and there are among fossil plants, Li-pido- 

 dendron dichotomaai Stbo-., Sat/enaria elegons >tbg., Knorria, 

 IqpMophyU , specie* of 

 . (hiuu't.,,,!*,;-*. v; „,-/,,,/, ,-,x :ib..ut inn.' ( a 



species of Sphenopteris, four Car! 



three of Alethopteris, etc. Similar facts are reported from the 



other district referred to. 



6. Revue de Geologie pour les Annies 1874-1875, Vol XIII; 

 by M. Dklesse, Ingenieur-en-( I de> Min. -. • t M. de Lapparext, 

 Ingenieur des Mines, Prof. Geol. 252 pp. 8vo, with a colored 



ricultural chart of France i! products, by 



Delesse. 1877.— From this valuable Geological Annual, bring- 

 I and dJ 



«g up the review of geological mem 

 middle of 1 875, we cite the following : 



Feldspathic rocks under the solvent actio,* of icater, carbonated 

 waters and other r, n, „/,■ ;„ ,»././//. ,..—M. Truchot subjected a 

 series of Auvergne rocks in powder for several days to water 

 charged with car wmre - >i eight atmospheres, 



and obtained the following percentage results : 



Granite of Trezioux."" VS." 0"90 '.'-'. °" 09 



Lava of Voivic 1-75 025 008 trace 



Domite, Puy de Dome 1-82 tr. 0-06 tr. 



Trachyte of Mt. Dore 2-90 tr. 0-18 tr. 



The trachyte was most readily attacked, especially its sili.-a, and 

 this accounts for the frequent occurrence of opal and other siliceous 

 de P08its in the fissures of this rock. a , , . , tn 



f. Cona, exposing the syenite of Bielle, finely pulverized, to 

 jater, dissolved 0-18 per cent at the ordinary temperature, and 

 °*42 at 100° C. ; to water saturated with C0 2 , dissolved 0-63 per 

 ce nt; to water saturated with >ulphate of lime, 0-43 per cent. 



