76 Scientific Intelligence. 
ing, by means of a Root exhauster, sulphurous acid gas, with 6 
to 8 vols. of sulphurous acid, from ordinary pyrites burners, mixed 
dense very perfectly the gases, but not so easy to deprive the 
liquors flowing fro e vast accumulation of soda waste, that 
encumbers old works, of their offensive ch An economical 
which, if practicable, : 
Seite process, has been proposed by Schaffner and Helbig. 
y the aid of MgCl, they convert CaS into CaCl, and generate H,5. 
I, CaS+-MgCl,4+H,O=CaCl,+Mg0-+FS. 
II. The H,S is drawn off and the S separated by SO,,—the 
difficulty heretofore always experienced of collecting the ex 
tremely fleecy sulphur being overcome by bringing the gases into 
contact with such salts as calcium or magnesium chloride, whet 
