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Mr. G. Gore on 



in magnitude, especially if the heat was continued until bubbles of 

 steam formed against the upper plate. 



During an examination, by means of this apparatus, of nearly all the 

 liquids named in this paper, I gradually ascertained the extent of this 

 interference of the washers, and found that even the most carefully- 

 prepared ones affected, more or less, the magnitude of the currents on 

 all solutions which were not neutral, or nearly so, to test-paper ; they, 

 however, rarely reversed the direction of the current. The degree of 

 tightness, also, to which the apparatus was screwed up largely affected 

 the quantity of the current in such liquids. 



In consequence of these circumstances, I devised and constructed 

 the apparatus here represented, and employed it for the purpose of 

 checking the results obtained with strongly alkaline or acid solutions, 

 in the one with circular plates ; those obtained with the more neutral 

 liquids less required checking. 



The chief part of this apparatus consists of a bent glass-tube (fig. 1), 

 with open cup-shaped ends, B and C, and an open exit- tube, D. This 



