440 Miscellaneous Intelligence. 



Some carbon was also obtained, but the amount could not be definitely 

 ascertained. 



AsBerzelius had given no name to this substance, Haidinger, in con- 

 currence with M. Patera, proposed for it the specific name of Schrei- 

 bersite. 



At a subsequent session (ioc. cit. No. 231) Haidinger, referring to 

 the name of Schreibersite, says he has since learned that the American 

 mineralogist and chemist, Prof. Shepard, at the session of the Asso- 

 ciation of Science at New York, on the 2d of September, 1847, had 

 given, in a very interesting paper on Meteorites, this same name to a 

 mineral, also of meteoric origin, which occurs in small brown striated 

 prisms in the meteoric stone of Bishopville, S. C, which fell in March, 

 1843, and was described by Prof. Shepard. 



Undoubtedly this latter name has the priority, but yet priority is only 

 a general rule which may in particular cases be deviated from. 



Haidinger, therefore, would be pleased to continue the name of 

 Schreibersite to the Arva Species, and would propose for Shepard's 

 new species, the name of Skpardite^ which very properly will connect 

 the discovery of the American species with the American naturalist, 

 while in a native species it will express our high regard for the worthy 

 naturalist of our own land. 



5. On the Preparation of a Glaze for Porcelain resembling Aven* 

 turine ; by A. Wjechter, (Liebig's Annalen, April, 1849 ; Chem. Gaz., 

 Aug. 1, 1849, p. 305.) — According to Wohler's examination, aventu 



rine glass owes its golden iridescence to a crystalline separation of 

 metallic copper from the mass colored brown by the peroxyd of iron. 

 In the aventurine glaze for porcelain a crystalline separation of green 

 oxyd of chromium from the brown ferruginous mass of the glaze pro- 

 duces a similar effect. I prepare this glaze as follows : 



31 parts of fine lixiviated dry porcelain earth from Halle, 



43 ... ... dry quartz sand, 



14 ... ... gypsum, 



12 ... ... fragments of porcelain, 



are stirred up with 300 parts of water, and by repealed straining through 

 a linen sieve uniformly suspended in it, and intimately mixed. To this 

 paste I add, under constant agitation and one after the other, aqueous 



solutions of 



19 parts bichromate of potash, 

 100 parts protosulphate of iron, 



47 parts of acetate of lead, 

 and then add so much solution of ammonia that the iron is completely 

 separated. The salts of potash and ammonia are removed by frequent 

 decantation with spring water. 



The baked porcelain vessels are dipped into the pasty mixture ob- 

 tained as above described iti the same manner as with other glazes, 

 and then fired in the porcelain furnace* After this they appear cover- 

 ed with a brown glaze, which in reflected light appears to be filled with 

 a countless number of little gold spangles. 



A thin fragment of the glaze appears, under the microscope, by 

 transmitted light, as a clear brownish glass, in which numerous trans- 

 parent green six-sided prisms of oxyd of chromium, and some brownish 





