324 Scientific Intelligence. 



8. JRicerche JPetrogrqfiche e Geologiche sulla Valsesia di E. 

 Artini e G. Melzi. Mem. del. Istit. Lomb. di Sci. e Lett., class, 

 di Sci. mat. e nat., vol. xviii, pp. 219-392, 4°. Milan, 1900. — 

 The region described in this memoir lies in the Alpine portion of 

 northern Italy, southeast from Monte Rosa and comprises mainly 

 the basin of the Sesia and its tributaries. It consists, chiefly of 

 highly crystalline rocks, of gneisses of several types, and mica 

 schist with lenses of crystalline limestone, lime schists and ser- 

 pentine associated with large masses of granite and gabbros pass- 

 ing into diorites and peridotites. These rocks have been care- 

 fully studied in the field and the results attained are given with 

 the aid of a geological map and cross sections. The petro- 

 graphic studjr of the rocks collected is presented in considerable 

 detail accompanied by twenty beautiful large plates reproducing 

 micro-photographs of the various rock types. The work, besides 

 its local value, is a considerable addition to our knowledge of 

 the crystalline rocks of the Alpine region. l. v. p. 



9. Influence of Country Bock on Mineral Veins / by Walter 

 Harvey Weed. Transactions Amer. Inst. Min. Engin., Mexi- 

 can meeting, November, 1901. — There is discussed in this 

 paper, first, the influence of the country rock on the shape and 

 size of the rock fissures in which subsequently mineral material 

 has been deposited ; second, the influence which the chemical 

 nature of the rocks may have on this mineral content. From his 

 discussion Mr. Weed concludes that the nature of the country rock 

 through which a vein fissure runs has determined in great part 

 the nature of the fissure, such as its course, width, etc. ; that the 

 character of the mineral contents of a vein, which is formed 

 wholly by the filling of an open fissure, cannot have been deter- 

 mined by the character of the wall rock, but that, in the case 

 where metasomatic replacement of the fissure walls has occurred, 

 the nature of those walls has influenced the character of the 

 minerals deposited ; lastly, that as the metasomatic processes 

 must vary with the variation of the mineral solutions, no invari- 

 able general relation can be established between certain rock 

 types and rich ore deposits. w. e. p. 



10. Additional notes on the Cambrian of Cape Breton, with 

 descriptions of 'new species / by G. F. Matthew, LL.D., F.R.S.C. 

 From Bulletin of Natural History Society of New Brunswick, 

 Canada, No. xx, vol. iv, pt. v, pp. 377-425, with 5 pits. — This is a 

 continuation of Dr. Matthew's studies on the Cambrian Faunas 

 of Cape Breton. The present article gives (1st) new species of 

 the Etcheminian or Basal Cambrian and (2d) a description of the 

 Tremadoc Fauna which has been found in one of the Cambrian 

 valleys. 



The following new species and mutations are described in this 

 paper and figured in five plates at the end. Acrothyra, 2 species 

 (one already published) and 6 mutations. Acroireta, 1 species, 

 1 mutation, and a species referred to an European form. Aero- 

 thele, 3 species (one already published) and 1 mutation. 





