ELECTRIC DISCHARGE WITH THE CHLORIDE OE SILVER BATTERY. 233 
facts to contribute to the general stock of knowledge ; but the field before us is so 
inexhaustible, that we think it better to offer the small amount of produce we have 
collected, with much labour, rather than wait, and by slightly increasing the offering, 
make it more acceptable. We are now engaged in determining the differences of 
potential between the terminals corresponding to different pressures with a given gas 
and a given vacuum tube. We defer for the present the suggestion of any theory to 
account for stratification, in the hope of being able to confirm experimentally certain 
views which we entertain as to the cause of this phenomenon. 
April 10th, 1878. 
Erratum. 
Part I., page 112 , for 
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