1897.] and the formation of Clouds in Charged, Gases. 253 



cloud is formed, and after leaving the gas in the inductor for 

 five minutes almost the whole charge is carried out when un- 

 electrified air is blown in ; but if instead of having sulphuric acid 

 in the bottom of the inductor some water be put into it, so that 

 when the gas is admitted a dense cloud forms, it will now be 

 found that after the lapse of five minutes only about half of the 

 original charge can be blown out — the remainder having been 

 carried to the surface of the water by the falling of the cloud. 



The Tables I. and II. contain the numbers, which were 

 obtained in experiments of this kind, N x denoting the charge 

 put into the inductor (in divisions of the scale) and N 2 the charge 

 blown out after five minutes. Table I. refers to the case where 

 sulphuric acid is in the bottom of the inductor, and Table II. to 

 the case where water was in the bottom of the inductor and a 

 cloud formed, T the number of minutes taken to put in the gas. 



Table T. 



Table II. 



17. In order to weigh the cloud and at the same time find 

 the electrification two methods were adopted. In the first method 



Fig. 3. 

 (The dotted lines indicate insulators.) 



20—2 



