On the Paragenetic Relations of Minerals. 305 



little subsequent to the zechstein ; up to the present time 

 at least, it is not known that cobalt or nickel minerals occur 

 in a sedimentary formation more recent than the latter. 



XIV. Barytic, Lead, and Zinc Formation. — Although this 

 formation is characterised as barytic, the most frequent 

 Iodic substance next to barytite is fluorspar. The lodes may 

 in other respects be classified into two groups, according to 

 the presence or absence of quartz. 



Among the minerals galena is the most characteristic. It 

 is generally poor in silver, irt some rarer instances without 

 any. There is perhaps no other formation of which it is an 

 essential member where it has suffered so many alterations. 

 The most ordinary products of decomposition are cerussite, 

 hyromorphite, mimetite, anglesite, leadhilite, phosgenite, 

 mendipite, plumbocalcite, and the very rare schwebleinz 

 (superoxide of lead). 



(To be concluded in our next Number.) 



On the Fossil Plants found in Amber. By Professor 



GOEPPERT. 



[Berlin Academy, Bulletin, 1853, pp. 450-476 ; and Leonhard u. Bronn's N. 

 Jahrb. f. Min. u.s.w. 1853, pp. 745-749.] 



Since Prof. Goeppert recognised the Taxodites dubius of Stern- 

 berg, which occurs abundantly in the plant-bed at Schosnitz, Silesia, 

 as the Taxodium distichum, Rich., now living in the southern parts 

 of the United States and in Mexico, and found also some fossil Plants 

 from Schosnitz to be identical with living species, thus pointing out 

 the identity of some tertiary plants with the living, he has had the 

 opportunity of examining a collection of 570 specimens of Amber, 

 containing plant-remains, belonging to M. Menge of Dantzig, and 

 30 specimens bequeathed by M. Berendt. With these the author 

 has been enabled to raise the number of the species of plants in the 

 Amber Flora from 44 to 163, of which only Libocedrites salicor- 

 nioides and Taxodites Europceus occur fossil out of the Amber, and 

 30 are identical with existing species. The constitution of the 

 Amber Flora, as at present known, is shewn in the following table.* 



* For the lists of genera and species, see the works ahove referred to. 

 VOL. LVl. NO. CXII. — APRIL 1854. 2 B 



