160 REPORT—1899, 
Hlectrolysis and Electro-chemistry.—Report of the Committee, consisting 
of Mr. W. A. Suaw (Chairman), Mr. E. H. Grirrirus, Rev. T. C. 
Firzpatrick, Mr. S. SKINNER, and Mr. W. C. D. WHETHAM 
(Secretary), appointed to report on the Present State of our Know- — 
ledge in Electrolysis and Electro-chemistiy. 
The conductivity of anumber of salts in very dilute aqueous solution 
at the freezing point of water has been determined by Mr. Whetham, while 
Mr. Griffiths has concurrently made observations of the freezing point for 
corresponding solutions. The observations of conductivity extend to 
solutions of sulphuric acid, potassium chloride, sodium chloride, barium 
chloride, copper sulphate, potassium permanganate, potassium bichromate, 
and potassium ferricyanide. The range of dilution is, speaking generally, 
from below the hundred-thousandth to about the twentieth part of a gram 
equivalent per thousand grams of solution. 
The water used was specially distilled three times, and finally 
from a platinum still, and collected in platinum vessels. Its approximate 
conductivity was about 1:1 x10-" at 18° C.in O.G.8. units. The best 
water obtained by Kohlrausch by distillation in vacuo had a conduc- 
tivity of 0:2 x10-” in the same units at the same temperature. 
The results obtained this year, while confirming those described at the 
last meeting of the Association for solutions of moderate concentrations, 
show differences when great dilutions are reached, but the constancy of 
the present measurements shows that the water now used is good enough 
to enable trustworthy values to be obtained even at the lowest limits of 
dilution above mentioned. 
Mr. Griffiths has remodelled his apparatus for determination of freezing 
points, and is now able to carry the measurements of temperature to a 
higher degree of accuracy than hitherto. 
As soon as the observations are completed it is intended to publish 
the results of both investigations together. 
No further progress has been made with the rest of the Report. 
Tables of Certain Mathematical Functions.—Report of the Committee, 
consisting of Lord Kenvin (Chairman), Lieutenant-Colonel 
ALLAN CunnincHaM, f.H. (Secretary), Dr. J. W. L. GLAISHER, 
Professor A. G. GREENHILL, Professor W. M. Hicks, Major P. A. 
Macmanon, and Professor A. LopGE, appointed for calculating 
Tables of Certain Mathematical Functions, and, if necessary, for 
taking steps to carry out the calculations, and to publish the results in 
an accessible form. 
Tue Tables (Binary Canon) were reported complete last year. The Com- 
mittee only wait fora grant to proceed with the printing, estimated at 
1202. for 100 copies, or 135/. for 200 copies ; a portion of which would be 
hereafter repaid by the sale of copies of the Tables. 
