2 Jones, Union of Hydrogen with Sulphur. 



or it does not, and it seemed to me worth while to make 

 some experiments to endeavour to settle the disputed 

 point. 



Hydrogen and Sulphur. 



In the first experiment, carbonic anhydride, purified 

 by being passed successively through water, sulphuric 

 acid, fuming sulphuric acid, asbestos and phosphoric 

 anhydride, was passed into a U tube containing purified 

 sulphur which was kept boiling. The exit tube of the 

 apparatus was so arranged that test papers moistened 

 with solution of lead could be applied from time to time. 

 At first these papers were considerably blackened by 

 the action of the escaping gas, but this diminished in 

 intensity, and when the apparatus had been in use for 

 some days the alteration in the papers was scarcely 

 appreciable and constant. When this minimum reaction 

 was reached the gas evolution apparatus \yas changed 

 for one evolving pure hydrogen, which was passed 

 through the same drying apparatus. In a very short 

 time the papers darkened rapidly, and when all the 

 carbonic anhydride had been expelled by the hydrogen, 

 the escaping gas smelt strongly of sulphuretted hydrogen 

 and instantly blackened the test papers. 



That the presence of moisture was sufficient to cause 

 the blackening of the test papers was then shown by 

 obtaining the minimum reaction as before with carbonic 

 anhydride, and then inserting a wash bottle containing a 

 few drops of water, just before the U tube containing the 

 boiling sulphur. In a very short time the test papers 

 were considerably blackened and large quantities of 

 sulphuretted hydrogen were evolved. 



This experiment shows the difficulty of removing 

 every trace of moisture from a gas, and at the same time 



