Manchester Memoirs, Vol. xlviii. {igo^), No. \^. 3 



the importance of effecting that object, if the formation ot 

 sulphuretted hydrogen is to be reh'ed on as an indication 

 that combination has taken place between hydrogen and 

 sulphur. Another experiment was therefore devised in 

 which the presence of water cannot interfere with the 

 accuracy of the result : A bent tube having one limb 

 longer than the other was obtained, the shorter limb was 

 sealed up, the longer one was open. A piece of pure 



fused sulphur was placed in the closed end at A and the 

 tube filled with hydrogen by displacement, the open end 

 of the tube meanwhile dipping in a solution of soda con- 

 tained in a test glass as in the sketch. Before withdrawing 

 the india-rubber tube which admitted the hydrogen, a 

 small quantity of the gas was withdrawn by suction so as 

 to raise the level of the liquid in the tube above that of 



