314 MR. HE. H. GRIFFITHS ON THE LATENT 
Reduction of the Observations given in Tables XI. (a) to XIII. (a). 
(See Tables XII. (b) to XIII. (d).) 
Col. XV. gives the value of Q,t. = (ek x 
1x J 
The correction for temperature of the cells was made by Lord RAYLEIGH’s coefficient 
(00077), but, as an inspection of Col. X. (supra) will show, the correction was in 
every case very small, except in XI. During the night of September 25 the Clark 
cell tank regulator ceased to work, and I found the cells at a temperature of 15°°8 the 
next morning. I considered it better to keep them at that temperature throughout 
the day than to raise it to 15° a few hours before an experiment. The correction in 
this case amounts to 1 in 1500, but is probably accurate to 1 in 5000. 
In a communication to the Royal Society, on November 22, 1894, Professor ScHUSTER 
pointed out an error in my determination of the value of J, viz., that I had not made 
a necessary correction for the specific heat of the air displaced by the water, for the 
method I adopted gave the difference in the rate of rise when a certain space was 
filled first with air and then with water. This correction raises my value of J by 
1 in 4000. Hence, in the following reductions I assume J=4°199 in place of 4°198.* 
As I have before pointed out, if in consequence of errors in my standards, &c., my 
value of J is inaccurate, it is still the right value to insert here, where I use the same 
standards, for errors of the kind referred to are thus eliminated. 
Co]. XVI. The value of Q, as deduced from Col. VI. by means of Table VL, 
Section VII. (supra). 
, XVII. The “stirring supply ” Q,t, from Cols. XVI. and V. 
, XVIII. The term 2q = C,, {(4’9 — 0”,) — (d’ — d’)} from Cols. VIL, VIIL, and 
IDG 
XIX. Gives the sum of Cols. XV., XVII., and XVIII., that is, the total 
number of thermal grams used in evaporating the mass M (Col. IIL.). 
3 XX. Repeats the value of 65, in order to render the reference less trouble- 
some. 
s 
_ XXI. The value of L, deduced from the equation L = Qetesises Greate 
M 
* This correction should xot be applied to the yalues of the specific heat of aniline given in Paper A. 
In that case the results also depended on the observations of differences, and if the corrected value of J 
was there used, a further correction for the specific heat of the air displaced by the aniline would have 
to be made, the final values remainiug practically unaltered. 
