ACTION OF THE HALOGENS,, ETC. 18H 



When SCI2 is used this breaks down into S^Gl^ and Clg, according 

 to the formula 2 SCI, =82012+ 2 CI, thus furnishing the necessary 

 chlorine for the chlorination process. 



Lastly, fuming sulphuric acid has again been shown to be a 

 splendid aid in the substitution of bromine and iodine in quinolines. 



