14-8 Intelligence and Miscellaneous Articles. 



'a 



barium, procured by the double decomposition of the neutral salt of 

 potash, and the chloride of barium and nitrate of lead; the barytic 

 salt was converted by calcination into carbonate, and the salt of lead 

 into sulphate. Four operations carefully conducted gave 4I53"895 

 as the mean atomic weight of the digitoleic acid. 

 The salt of lead consists of — 



10000 



Several salts of the new acid were prepared and examined by M. 

 Kosmann. 



Digitoleate of Potash. — The acid was treated cold with bicarbonate 

 of potash and water ; the solution is slowly effected, but takes place 

 in a few hours with the slow disengagement of carbonic acid ; the 

 filtered solution was evaporated to dryness by the water-bath, and 

 the residue tested with cold alcohol of 85 per cent., which dissolved 

 the potash-soap ; the alcoholic solution filtered and evaporated left a 

 greenish-brown residue, which became a confused crystalline mass 

 intermixed with needles, the odour of which was aromatic, and the 

 taste bitter and acrid ; it does not effervesce with acid, and yields by 

 the action of heat an odorous matter and carbonate of potash. The 

 aqueous solutions froth like soaps. 



Digitoleate of Soda. — This salt was prepared like the preceding, 

 with bicarbonate of soda ; the alcoholic solution left by evaporation 

 a scaly mass of a brownish-green colour, without any trace of cry- 

 stallization ; the aqueous solution, frothed by agitation, does not effer- 

 vesce with acid, and has a bitter acrid taste. This soap is soluble 

 in sether, and by the action of heat emits an odorous vapour, and 

 yields a residue of carbonate of soda. 



Digitoleate of Morphia was prepared by the double decomposition 

 of digitoleate of potash and acetate of morphia. The properties of 

 this salt are, that it is a greenish precipitate, which adheres strongly 

 to the sides of the vessel. After repeated washing, it was treated 

 with alcohol, which dissolved it and formed a bright green solution, 

 that deposited by slow evaporation fine flattened rectangular prisms 

 with square bases, the colour of which was greenish with a metallic 

 lustre ; they were insoluble in water. — Journ. de CMmie Me'dicale, 

 June 1846. 



ON A REMARKABLE FELS1TE FROM MAR1ENBERG. 

 BY A. BREITHAUPT. 



This felsite occurs in veins of tinstone, traversing gneiss at Mar- 

 tersberge, and at Wilsberge near Marienberg in Saxony, accompa- 



