1824.] Scientific Notices — Chemistry. 149 



soluble in muriatic acid, the solution being precipitated by 

 water. Its solution giving, with prussiate of potash, a blue 

 precipitate brighter even than that with solution of iron, but 

 not precipitating with tincture of galls. 



The button was therefore dissolved in nitric acid, which left 

 a blackish powder in small quantity, and also some grains of 

 siliceous sand. The powder was well washed, and then being 

 heated on platina foil in the flame of a spirit lamp, did not 

 burn or volatilize, but became of a deep red colour. Muriatic 

 acid being added to another portion of the washed powder, and 

 a gentle heat applied, dissolved by far the greater part of it, 

 forming a red solution which being evaporated till the excess of 

 acid was driven off, and then tested, gave a blue precipitate with 

 prussiate of a potash, black with tincture of galls, and a reddish 

 brown with ammonia. 



On evaporating to dryness it left muriate of iron. Nitro- 

 muriatic acid being made to act on the minute portion of pow- 

 der yet remaining, dissolved very nearly the whole of it, leav- 

 ing a small trace of silica, and producing a solution similar to 

 the former. Hence the Taschium in this button of silver was 

 nothing else than iron, and from the presence of siliceous sand 

 it may be supposed to have been introduced into the button 

 through the inaccuracy of the preparatory manipulations. 

 M. F. — (Journal of Science.) 



4. Chalybeate Preparations of the London Pharmacopoeia. 



The following table exhibits what quantity of each prepara- 

 tion contains one grain of oxide of iron : 



One gr. of oxide is contained in gr. 3*8 Ferri Sulphas 



Do. do. 66*0 Subcarbonas 



Do. do. 1*2 Ferrum ammoniatura 



Do. do. .3-0 Tarlarizatum 



Do. do. 20U Pilulse Ferri composite 



Do. do. it^xxx Liquor Ferri Alkalini 



Do. do. tgiss Mistura Ferri composita 



Do. do. f^iij Tinctura Ferri Ammoniati 



Do. do. tr^xiv Muriatis 



Do. do. fsj Vinum Ferri fit. P.) 



5. Zirconia in Black Pepper. 



The Journal de Pharmacie for May last contains the following 

 notice on the above subject : — u M. Dublanc,jun. read a notice 

 <»f a work of M. Meli de Ravennes, relating to the discovery of 

 zirconia in black pepper, by M. le Comte Paoli de Milan." 



(J. On the Use of Nitrous Oxide in Eudiometry. 



Multiplied experiments prove atmospheric air to contain -,*,/_ 

 uf oxygen, yet nitrous gas sometimes indicates less, sometimes 



