134 



THE ROYAL S(^CIETY OF CANADA 



Wulf* obtained a similar result, thus — 



Barometer 770-765 764-760 759-755 754-750 



Penetrating Radiation 4*6 5-0 5*5 5*65 



Difference 1-05, closely agreeinj? with my value. 

 *Le Radium, T VII. June, 1910. 



