5 92 Rays of Positive Electricity. [March 22, 



that had never lost its charge temporarily by colHsiou were greater 

 than lO"^ — we should expect to get larger values for — at low pressures 



than at high. 



I have much pleasure in thanking my assistant, Mr. E. Everett, 

 for the assistance he has given me in these experiments. 



[J. J. T.] 



