32 McCienianp Anp Hacxetr—Secondary Radiation from Compounds. 
As it is the constant p, and not x, which is measured directly in the experi- 
ments, the values of » have been given in the table. As stated earlier in this 
paper, the relation between p and x is— 
4 
Sem 
In calculating « for a compound, the values of « for its constituents are taken 
from the table given in the previous paper referred to above. Chlorine and 
oxygen, which occur as constituents in some of the compounds tested, are not 
included among the elements examined in the previous paper; but sufficient other 
elements of neighbouring atomic weights are included to enable the value of « for 
these elements to be fixed with accuracy. 
TABLE. 
SUBSTANCE. p x 100 calculated. p x 100 observed. 
Helo: mete ena 45°5 46°5 
Bils, ' : | 45 46°5 
Chel, ; : 42°5 42°5 
KI, : $ au 38 38:5 
PRESS seen 45 46 
ics ee : j 44 46 
BisS3,0. 5 4s ae 43 46:5 
SnS. Pua: ees mre 38 38°5 
SbiGsees eg ae 36:5 37-5 
TAS ok a ee 33 34 
CuS, : j : 33 38 
CaS, 3 4 : 27 27°5 
Hel, . : F 44 46°5 
HegCl,, . : : 4] 42 
POs te te 45 | 47-5 
PDOs eos mes 42 46 
SnO® vey 9 eel 38 39 
YAO ee dee, Viel 31:5 34 
CuO, . : st 31 32 
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