716 SEC. 16. GFOLOGY AND MINING. 



3315. Collection of Thin Sections of all the rocks occurring 

 in the Fichtelgebirge. 



Geognostic Survey of Bavaria (Dr. Giimbel). 



The collection of thin sections illustrates the method of collecting and 



examining, large numbers of slices from the same rock and locality being 



prepared. The accompanying plate shows sections of a few of the most 



important of these rocks magnified and printed in colours. 



3316. Pictures of the most important of these Hocks, as 

 drawn from sections under the microscope. 



Geognostic Survey of Bavaria (Dr. Gumbel). 



3317. Collection of Hand Specimens of Typical Ter- 

 tiary Basalts and altered enclosures (68 specimens), illustrated 

 by one hundred thin sections. 



Mineralogical and Geognostical Cabinet of the School oj 

 Industry, Cassel (Dr. H Mohl). 



The classification of the Basalts is that begun by Professor F. Zirkel, and 

 amplified by the exhibitor, as illustrated in Paper No. I. Special descriptions 

 of these rocks and their structure will be found in the Papers 1I.-VIL, the 

 figures being contained in Paper X. 



3318. Collection of Hand Specimens of Typical Fhono- 



lites and nearly related Andesites (38 specimens), illustrated by 

 seventy thin sections. 



Mineralogical and Geognostical Cabinet of the School of 



Industry, Cassel (Dr. H. Mohl). 



The classification of the Phonolites by the exhibitor is contained in 

 Paper No. IX., the felspar phonolites of other authors being omitted as ap- 

 proaching more to the trachytes. Drawings and descriptions of normal types 

 are found in Paper No. X., with the original plates G and H. 



3319. Collection of Hand Specimens of Typical Basal- 

 tit es (Melaphyre, Palatinite, Minette, Kersanton and Kersantite), 

 also Porphyrite (48 specimens), illustrated by ninety thin sections. 



Mineralogical and Geognostical Cabinet of the School of 

 Industry, Cassel (Dr. H. Mohl). 



For reasons in favour of adopting the name Basaltite, see Paper No. 8, 1st 

 and 2nd part. The descriptions of two so-called minettes will be found in 

 Paper No. VII. , 3rd part. 



3320. Thirteen Papers relating to the above rocks and sec- 

 tions, with drawingSj also ten coloured plates of drawings of thin 

 sections (amongst them six original plates). 



Original water-colour drawings. 



Mineralogical and Geognostical Cabinet of the School of 

 Industry, Cassel {Dr. H. Mohl). 



3319a. Collection of Specimens of Rocks of the Canary 

 Islands. Don Salvador Calderon, Madrid. 



These specimens are accompanied by a memoir by Senor Calderon, on the 

 rocks of the Canary Islands, entitled " Resina de las rocas de la isla volcanica 

 Grau Canaria." 4 Madrid, 1876. 



