ITEW GEOTECMIC MODELS 



FOR THE ILLUSTRATION OF THE 



ARCHITECTURE OF THE EARTH'S CRUST. 



Constructed by Prof. Dr. L. Duparc (Geneva), and by Prof. Dr. A. 



Schmidt (Bale). 



These models, made of plaster, are constructed in such a manner as 

 to show not only the geological features of the surface, but also on the 

 sides diagrammatic sections illustrate the structure of the underlying 

 crust. To each such model belongs a cap representing the masses of 

 rocks, which are supposed to have been worn away by denudation, and 

 showing the way in which the folding of the strata has taken place. 

 The motives are taken from some of the most interesting parts of the 

 Alps and the Jura Mts. in Switzerland. Among these are also two dif- 

 ferent representations of the renowned " Gldrner double fold ivith 

 inversion and thrust-plane" 



Price of the set of 8 models by Prof. Dr. L. Duparc, size about 

 40 x 20 x 10 cm., the Glarner double fold about*100 x 22 x 10 cm. $100.00 



Price of the Glarner-double-fold model by Prof. Dr. A. Schmidt, 



size about 100x22x10 cm. 25.00 



(An accurate description of these models will be sent free on 

 application.) 





New Collections of Rocks and Thin Sections. 



Collection A. In addition to the well-known collection of 250 rocks 

 and thin sections, according to Prof. Dr. Rosenbusch's book on 

 Petrology, I have now arranged an extension of the same, consisting of 

 30 rocks and sections ; most of them are very rare and interesting 

 types of rocks which I was fortunate enough to collect during the 

 last year. 



(Such rocks as Monchiquite, Tinguaite, Leucitsyenite, Gauteite, Boro- 

 lanite, Ijolithe, Jacupirangite, etc., etc.) 



Collection B. This collection has been arranged according to Prof. 

 Dr. H. Rosenbusch's book, " Elemente der Petrographie,'" and contains 

 only rocks and sections of the crystalline schists and sedimentary rocks, 

 thus forming a 



Supplement to the collection of 250 Specimens. 



Price of collection A, 30 specimens, size 8J^ : 11 cm.= $13.50 



" " A, together with 30 thin sections — 23.50 



" " B, 50 specimens, size 8^ : 11 cm. = 11.00 



" " B, together with 50 thin sections = 27. 50 



Collections of Minerals, Fossils, Meteorites purchased for cash or 

 exchanged. 



RHENISH MINERAL OFFICE, 



BONN-ON-RHINE, GERMANY. 



