250 
PROFESSOR H. A. WILSON ON THE EFFECT OF HYDROGEN ON THE 
Hence A must be equal to K p c , and Q must be equal to P —2a logy, where K and 
P are constants. Also n = aO~ 1 —c. 
The following table contains values of Q calculated from the results given in the 
previous paper, together with Q +2a logy, taking a — 2400. 
p- 
Q- 
Q + 2a log p. 
millims. 
0-0013 
110000 
78000 
0-112 
90000 
79500 
133 
56000 
79500 
It will be seen that Q + 2a logy is nearly constant, so that we have 
Q = 79000 —2a logy). 
It appears therefore that the observed variation of Q withy) agrees very.well with 
that calculated on the assumption that x = By" at constant temperature. 
Since n — 0'75 at 1350° C., and a = 2400, we have c = ad~ l — n=0'73, so that A 
varies inversely as y 0 ’ 73 . 
