380 



Dr. Willows and Mr. Peck on the Action 



The curve is practically a straight line up to a spark- 

 length o£ 12 cms., after which the sensibility rapidly increases. 

 It is at this point also that the dark space first appears. 



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The appearance of the discharge with spark-lengths 4, 7, 

 and 13 cms. is shown in the sketches A, B, &c. respectively 

 of fig. 2. 



When the anode consisted of a piece of No. 22 wire, with 

 which the discharge passed nearly entirely in brush form, 

 the radium had no, visible effect. Both this and the fact that 



