s 
Chemistry and Physics. 279 
substance (Compt. Rend. des Trav. de Chimie, Fevrier, p. 34), sugges- 
ted that its real formula is CCl, NO, (corresponding to C, Cl, NO, in 
formula which requires carbon lorine 65, and azote 8-4, has 
been verified by analyses made by M. Cahours upon a pure s 
has 
vented hitherto by the presence of the tin; the present process is pro- 
posed for its removal. 
hot solution of alkaline persulphuret, for instance, persulphuret of 
sodium, obtained by fusing sulphur with carbonate of soda, converts the 
tin into sulphuret which is retained in solution, leaving the iron per- 
fectly free from tin. 
he same end is attained, although in a less perfect manner, by a 
Solution of oxyd of lead in caustic alkali, or by alkaline chromate in 
the caustic alkali. The former, however, produced a deposit of me- 
tallic lead, the latter of chromic oxyd, and the removal of either of 
these is attended with inconvenience; the first process is therefore 
preferred. 
verberatory furnace ; carbonaceous matter with dry carbonate of soda 
or quicklime is then added and the tin reduced. The slag resulting 
may be added to form again the solution for stripping the tin plate. 
in has been removed are was 
p n, A 
7. Anisole, Salicylic Ether, and substances derived from 
C 
show its extension to compounds originally containing oxygen. This 
remark applies to the researches before us, The value of this exten- 
nearer than ever to the fulfilment of the promise long since made, of 
the artificial formation of quinine, morphine, &c. 
