Inlelligence and Miscella)ieous Articles. 235 



to obtain it glucina is employed, prepared by M. Vauquelin's method- 

 it is to be dried, mixed with sugar and flour, and calcined. It yields 

 a compound of glucina and finely divided charcoal ; this mixture is to 

 be put into a porcelain tube, and chlorine passed over it. The chlo- 

 ride of glucinum formed, collects at one end of the tube in the form 

 of white brilliant needles. It is mixed with chloride of iron, from 

 which it is separated by distilling it in a glass tube ; the two chlorides 

 separate ; the chloride of glucinum is afterwards treated with potas- 

 sium and heat ; potash is formed, and glucinum developed ; when 

 treated with water, the potash formed and the chloride of glucinum 

 unacted upon are dissolved, and the glucinum is left. 



Glucinum is of a brown colour ; it is in small scales ; nitric and 

 muriatic acids dissolve it readily. When thrown into a red hot pla- 

 tina crucible it burns vividly, and oxide is produced ; the metal of the 

 crucible is much altered : the chloride of glucinum is extremely deli- 

 quescent; when thrown into water it occasions a hissing, similar to 

 that of red hot iron when similarly treated. — Ibid. 



TEST FOR OXYGEN IN A GASEOUS MIXTURE. 



M. Kastner considers that protoxide of iron is the most sensible 

 test of the presence of oxygen which has ever yet been employed. It 

 is prepared by filling a well stopped flask with hot water ; about 

 l-20th of its weight of recently prepared sulphate of iron is then 

 dissolved in it, and ammonia is added to the solution while hot, and 

 in excess. When this is done, the flask is to be securely closed until 

 the precipitate is perfectly formed ; all the fluid is afterwards to be 

 decanted by a syphon, and the precipitate is to be washed with 

 water which has been previously well boiled, and the flask is then to 

 be filled with hot alcohol. 



When this protoxide is to be used, it is taken quickly by means of 

 a small spoon, and it is to be put into a vessel nearly filled with 

 water which has been deprived of air by boiling. Into this vessel the 

 gas to be examined is passed ; and if it contain lOOOdth of its bulk 

 of oxygen, it is indicated by the ochrey appearance of the oxide of 

 iron. — Ibid. 



CARBON IN PIG IRON. 

 According to M. Karsten, white pig iron contains more carbon 

 than gray pig iron. The following are the proportions of carbon per 

 cent in pig iron, according to several of his experiments : — 

 White Pig Iron. 



Combined carbon 0-60 O'Sl 1 "00 



Uncombined carbon. . 4*62 4*29 4*05 



5-22 5-10 505 

 Gray Pig Iron 



Combined carbon 0*89 1'03 0-75 0-58 0-95 



Uncombined carbon., 37 1 3-62 3-15 2-57 270 



4-60 4-65 3-90 3)5 365 



Bull. Univ. Roy. Inst. Journal. 

 2 H 2 DISCOVERY 



