I. GEOLOGY. 717 



3321. Thin Sections of typical rocks in a box (90 specimens). 



Voigt and Hochgesang, Gottingen (Gust. Voigt). 



Contains rocks selected according to F. Zirkel's "Microscopical Cha- 

 " racters of Minerals and Rocks." 



3322. Thin Sections of typical rocks in a box (20 specimens). 



Voigt and Hochgesang, Gottingen (Gust. Voigt). 



Collected by Dr. v. Seebach, and described by Dr. F. Zirkel, Leipzic. 



3323. Series of the most characteristic Porphyries of 



Silesia, with thin sections of the same, in a case. 



University of Breslau (Prof. A. von Lasaulx). 



3324. Collection of Thin Sections of the rocks of Saxony. 



Royal Saxon Mining Academy, Freiberg. 



3325. Series of Leaf Remains, from the Lower Bagshot beds 

 (Middle Eocene), collected on the coast between Poole Harbour 

 and Bournemouth. J. Starkie Gardner. 



These leaves occur in isolated lenticular patches, usually of small extent, 

 and were deposited in fresh, water, which probably flowed from the north-west. 

 Their horizon is slightly higher than the well-known leaf beds of Alum Bay, 

 the flora of which presents considerable differences in character. Collections 

 from Alum Bay are in the British and Jenny n Street Museums. 



3326. Globe mounted for the study and demonstration of the 

 angular relations of directions presented by lodes, dykes, lines of 

 dislocation, mountain chains, coast lines, and river valleys. 



Jos. P. O'Reilly, Dublin. 



This globe allows of the tracing of great circles through given points, with 

 great facility and rapidity. These great circles can be transferred to maps, 

 and serve as bases of comparison for the lode systems of mining districts, and 

 in general for all geological lines of direction. 



The above was designed by the exhibitor in 1874, and used for public 

 lectures. A similarly mounted globe was shown in Paris at the Geographical 

 Exhibition of 1875, by M. Chancourtois. 



3327. Portable Apparatus, for preparing Sections of rocks, 

 minerals, fossils, &c., for microscopic examination. 



F. C. Cuttell. 



3328. Lapidary Apparatus for slitting, grinding, and polish- 

 ing rocks, pebbles, fossils, &c., especially adapted for the 

 preparation of thin sections of rock or other hard material for 

 microscopical examination. Designed by Mr. James B. -Jordan, 

 and manufactured by Messrs. Cotton & Johnson, Soho. 



James B. Jordan. 



