122 GEOLOGY. 



Watts, W. L. On Iceland, its Ph)'sical Aspects, Characteristics, (fee. 



23>Y^ Ann. Hep. Brighton Nat. Hist. Soc. pp. 78-91. 

 Describes the volcanoes, geysers, glaciers, &c. 



. Journey across the Yatna Jokull, in the summer of 1875. 



Proc. R. Geogr. Soc. vol. xx. pp. 21-32. 

 Contains some remarks on the craters visited and the character of 

 the volcanic ejecta. 



. Weiss, E. Blatt Saarlouis. Erlaut. geol. Sjpezialkarte Preuss. Grad- 

 abth. 80, Bl. 39. 



. Blatt Heusweiler. Ibid. Bl. 40. 



. Blatt Friedrichsthal. Ibid. Bl. 41. 



. Blatt Neunkirchen. Ibid. Bl. 42. 



Explanations of these sheets of the Prussian Geological Survey Map, 

 comprising Carboniferous, Permian, Trias, and Drift. 



Weiss, E., and H. Grebe. Blatt Gross Hemmersdorf. Erliiut. geol. 



Spezialkarte Preuss. Gradabth. 80, Bl. 38 ; view and section. 

 Describes Triassic rocks. 



Weltz, C. De Trondhjemske Kisforekomsters Oprindelse. [Origin 

 of the Trondhjem Siliceous Deposits.] Polyteknisk Tidslcrift, 

 Arg. 23, hiift 4. 



Wibel, F., and C. Gottsche. Skizzen und Beitragc zur Geognosie 

 Hamburgs und seiner Umgebung. [Sketches and Contributions 

 to the Geology of Hamburg and its Neighbourhood.] Festschrift 

 der 49. Versam. deutsch. Naturf. Aerzte. (Noticed in N. Jahrb.) 



Wiik, F. J. Ofversigt af Einlands geologiskaforhRUanden. [Peview 

 of the Geology of Finland.] Pp. 1-104 and 1-89, with a geo- 

 logical index-map of the southern and middle parts of Finland to 

 the scale of 1 : 2,520,000. Academical paper. Helsingfors. 



The first part refers to the petrographical characters of the rocks, 

 their distribution and stratigraphy. The following formations are 

 described — Laurentian gneiss, Huronian mica schist, Taconic (quart- 

 zite-talc schists), eruptive rocks and Post-Tertiary deposits. The 

 origin of the various rocks and superficial deposits is noticed. The 

 second part contains Orography and Geognosy. The author thinks 

 that the stratigraphical and orograj^hical main directions in Finland 

 might be expressed by some few crystallographical zone-lines; and he 

 calls attention to the relation existing between the mountain- chains 

 and the coast-lines of other continents and certain distinct main lines. 

 The origin of the earth, the probable nature of the interior and the 

 different theories on the subject, and the formation of the primitive 

 rocks are noticed. E. E. 



Wolf, H. Die Eutschuug am Kahlenberg-Gehange langs der Donau. 



