Intelligence and Miscellanies. 389 
0 drocyanic acid. Thinking that some mistake had 
been made in the preparation, he renewed it and obtained 
the same result . Blei, apothecary at Pemberg, has also 
Lastly, M. Mentzel has just proved the presence of iodine 
in an ore of zinc from Upper Silesia. —Fer. Bull. Nov. 1828. 
41. Size of the grains of native platina—The cabinets 
of Europe scarcely contained any grains of native platina 
larger than a line in diameter until M. Humboldt brought 
one from South America weighing 1088 grains. This was 
the largest known until 1822, when the Museum of Madrid 
was enriched with a native specimen two inches and four 
mines of Demidoff, in Oural, proved by Professor Lubarsky 
of St. Petersburgh, in 1823, to be native platina, contaming 
an alloy of iridium and osmium. It weighs four thousand 
