Emanation and Active Deposit produced by it. 



371 



negative one the active deposit was greatest close to the salt, 

 and was distributed in gradually decreasing amounts at points 

 on the plates farther and farther from the salt. The curves 

 given in the paper for the distributions corresponding to the 



Fig. 1. 



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other pressures were of the same general character. It was 

 found, however, that while at atmospheric pressure by far 

 the greater part of the active deposit was found on the 

 negatively charged plate, at the other pressures investigated 

 the deposit on the positively charged plate became relatively 

 greater, and at 5 mm. was almost identical in amount with 

 that obtained on the negative plate. 



In a second series of experiments observations were made 

 on the amount of deposit obtained on the plates at a point 

 2*5 cm. above the salt, when the pressure of the air in the 

 vessel in which the plates and salt were placed was gradually 

 diminished. The results for this set of observations are 



