DR. F. KRANTZ. 
Ehenish Mineral Office and Publishing House, 
BONN ON THE RHINE, GERMANY. 
Established 1833. 
Furnishes Minerals, Meteorites, all kinds of Rocks, 
Fossils and Plaster Casts of rare Fossils, Meteorites and 
of the largest Gold Nuggets as well in systematically 
arranged Collections, large or small, as in single Speci- 
mens. Imitations of Precious Stones and of the most 
celebrated Diamonds, Crystal-Models and Artificial 
Crystals. 
Has Manufactories, 
1. For working models of crystals in wood and glass with mathematical 
exactness. The models of crystals of table glass including the colored axes, or 
with regard to hemihedral crystals, including the holohedric form in wood, 
represent an indispensable object for declaring the simple and the hemihedral 
forms of crystals to larger auditories. Collections of wood models at $5, 9, 14, 19, 
31, up to $640. Collections of glass models at $10, 20, 45, and $100 upwards. 
2. For preparing thin sections of rocks and fossils for microscopical investiga- 
tion. 
3. For manufacturing plaster casts of rare fossils, meteorites, geological 
objects, relief maps of mountains and countries of geological interest (Hartz 
Mountains, environs of Coblenz, Ems, Kaiserstuhl, etc). 
Special Catalogues will be sent on application. 
No. I. Minerals ; Imitations of Precious Stones and of the most celebrated 
Diamonds ; Crystal models in wood and in table glass; Artificial Crystals; 
Mineralogical Apparatus, etc., etc. 
No. II. Fossils; General Geology (Illustrated). 
No. III. Plaster casts of rare fossils, and of the most famous gold nuggets and 
meteorites (Illustrated). 
No. IV. Rocks ; thin sections of rocks ; petrographical apparatus, etc. 
No. V. Catalogue of a collection of 743 crystal models in wood, arranged by 
Prof. P. Groth (Mineralogical Collection). Price $0.70. 
No. VI. Catalogue of a collection of 412 crystal models in wood, arranged by 
Prof. P. Groth (Crystallographical collection). Price $0.35. 
No. VII. Catalogue of a collection of 213 crystal models in wood, arranged by 
Prof. P. Groth (Supplement to No. V). Price $0.30. 
No. VIII. Catalogue of a collection of 132 crystal models in wood, arranged 
by Prof. C. Hintze (Student collection). 
No. IX. Description of 100 thin sections ot rhenish rocks by Dr. W. Bruhns. 
Price $0.25. 
No. X. General American Catalogue for Mineralogy and Geology (Illus- 
trated). 
