Scientific Intelligence, — Mineralogy. 197 



12. Ht/cena Cave. — M. Billaudei, civil-enginer at Bour- 

 deaux, discovered in a quarry on the banks of the Garrone, a 

 cavern, in which he found a quantity of the bones of various 

 animals, among them jaws of the hyaena, of the Hon, or the ti- 

 ger, and of the badger, bones of the fox, &c. 



MINERALOGY. 



13. Crystallizations of Sulphate andCarbonate of Lead observed 

 byM.Hartmann. — The following forms of sulphate of lead (Pris- 

 matic Lead Spar) were observed in a series of beautiful specimens, 

 from a vein in transition clay-slate, near the smelting works of 

 Tanne, five hours from Brunswick, by the translator of Beudanfs 

 Mineralogy, M. Hartmann, and by him communicated to us : — 



1 . (P r -f- X )3. P — X . very frequent in crystals half an inch 



in length, which are often tabular. 2. (Pr -|- x)3. Pr resem- 



blingfig. 1 . Mollis Treatise^ vol. ii. 3. (Pr -f x )3. Pr. P — x . 



4. (Pr + X )3. Pr -f X . 5. P-|-x . P. 6. (Pr + x y, Pr. Pr. 



7. (Pr-|-x.)3Pr-|-x. P — x. Twin crystals exhibiting 

 the form represented in PI. III. Fig. 5. M. Hartmann observed, 

 from the same place, the following combinations of carbonate of 



lead, or white lead spar : — 1. P. % P. (Pr -|- x )3. Fig. 54. 

 PI. 91. Hauy. 3. M. 1. s. (Hauy's Letters) 4. M. 1. f. u. 

 Fig. 36. Hauy, 5. M. 1. s. y. Fig. 57. 6. M. e. 1. f. k. u. 

 Twin, or rather triple crystals, grouped according to the law in 

 Fig. 65, PI. 93. Hauy, ar^d the termination of the planes 

 P. n. i. 



14. Geognostic Positiofi of Platina in America. — Hitherto 

 this metal has been found, in the New World, only in the alluvial 

 districts of Choco and of Brazil ; but Mr Boussingault has disco- 

 vered roundish grains of platina, mingled with native gold, in 

 veins in the province of Antioquia. These veins traverse a 

 formation of greenstone, diorite, and syenite. 



15. Jet discovered in Wigtonshire. — Beautiful specimens of 

 this mineral have been found between a bed of peat and yellow 

 clay, in the peninsula formed by Loch Ryan and the Irish Chan- 

 nel, by Sir Andrew Agnew. 



16. Geognostical Distribution of Gold in the Uralian Moun- 

 tains. — The gold-bearing districts in the Uralian mountains are 



