MINERALOGICAL AND GEOLOGICAL GEN- 

 ERAL CATALOGUE, Nr. 18. 



The SECOND edition of Part I. of our General Catalogue of teaching 

 appliances, instruments and utensils for Mineralogy and Geology and their 

 brandies, has just come out. It has been extensively enlarged, the first 

 part of this second edition alone covering 260 pages with 110 illustrations 

 as compared with the first edition of 128 pages only. Compiled with the 

 view of offering everything that is needed for the instruction of these 

 sciences in middle- and high-schools, its completeness is such that a num- 

 ber of the different collections of minerals, crystal-models, rocks, fossils, 

 etc., will be found well suited for students' practical work in the min- 

 eraiogical and geological institutes of the universities. 



AMONG THE NEWLY ARRANGED COLLECTIONS ARE' THE 

 FOLLOWING: 



"Practical Introduction into Petrology:" two small collec- 

 tions of 25 specimens each of the MOST IMPORTANT (a) ROCK-FORM- 

 ING MINERALS and (b) TYPES OF ROCKS with thin sections and lan- 

 tern slides, and a description containing reproductions of micropholographs of 

 each rock-slide for the first introduction into the elements of petrology ; 

 arranged by Professor Dr. Busz. 



Collection for the Demonstration of the Formation of 

 Coal, arranged by Professor Dr. H. Potonie, according to his book on 

 ' ' Entstehung der Steinkohle. ' ' 5th ed. , Berlin, 1910. 



Collections for the Demonstration of the Decomposi- 

 tion, Alteration, and. New Formation of Rocks ; 14 differ- 

 ent collections of 8 specimens each, beginning with the unaltered rocks 

 (eruptive and sedimentary) and following the different stages of decomposi- 

 tion, etc. 



Collections to Demonstrate the Formation of the Moors 

 according to the instructions of Professor Dr. Tacke, Director of the Moor- 

 Institute at Bremen. 



For more extensive collections see our new catalogues Nr. 1 (Mineralogy, 

 etc.); Nr. 4 (Petrography: rocks, thin sections and lantern slides); Nr. 

 17 (Practical Petrography: collection of 336 rocks and thin sections); Nr. 

 16, 19 and 23 (Crystallography); Nr. 2a and 26 (Geology and Paleon- 

 tology). 



Collections and, Single Specimens of Minerals, Fossils, Meteorites, bought and 

 exchanged. 



IDIR,. IF. keantz, 

 RHENISH MINERAL OFFICE, 



BONN-ON-RHINE, GERMANY. 



Established 1833. Established 1833. 



