8 THE ROYAL SOCIETY OF CANADA 
III. —On Variations in the Intensity of the Penetrating Radiation. 
Although the time at the disposal of the writer in making the ob- 
servations was limited and as a consequence they were not as extensive 
as one would wish to have them, still they were sufficiently numerous 
at two stations in Great Britain to show that if variations did occur at 
these two places such variations in the intensity were not greater than 
at most two or three per cent which is about the accuracy with which 
readings can generally be made with the instrument used. 
The successive readings taken at Cambridge on a number of dif- 
ferent days are given in Table II and those taken at different times at 
Bowland, Scotland, are given in Table III. 
TABLE II. 


Values of “‘q’’ obtained at Cambridge. 



Date. Hour of the Day. | Value of q. 
AURA ue | 3.30 p.m. 9-22 ions per cc. per sec. 
LS EE eee | 5.30 p.m 9-52 
Diller tee acest 6.00 p.m 8-84 
DD eme ae 6.45 p.m. 8-76 
DO ersten CRU 5.30 p.m. | 8-82 
Sept TRE A. 12.00 noon. 8-98 
Dot fo ROSE 10.45 a.m. 9-19 
RAT ATE 10.50 a.m. | 9-00 
DRE anny cer 10.30 a.m. 8-95 
Mean 9-03 



TABLe III. 


Values of “q’’ obtained at Bowland, Scotland. 



| 
Date. | Hour of day. | Value of q. 
Sept: 14. ser. | 10 a.m. 8-32 
| 11 a.m. 8-32 
12 noon 8-32 
| 1 p.m. 8-32 
| 2.30 p.m. 8-32 
Mean 8-32 


