72 REPORT — 1892. 



meteorological phenomena already referred to in our previous reports. A 

 considerable proportion of the observations beginning with July 1890, 

 when the Low Level Observatory was fully equipped, having been re- 

 arranged on daily sheets, on which hour by hour the double set of obser- 

 vations are contrasted, and the changes noted from each hour to the hour 

 following. These changes are then compared with the bi-daily weather 

 maps of the Meteorological Council, and more particularly with the 

 observations made at the stations of the Scottish Meteoi'ological Society, 

 which include the valuable observations made at the northern lighthouses 

 of storms of wind and rain, and other phenomena, which are made night 

 and day by the keepers of the lighthouses. 



Seventh Report of the Committee, consisting of Vrofessor Fitzgerald 

 (Chaii^man), Professors H. E. Armstrong and 0. J. Lodge (^Secre- 

 taries), Professors Lord Kelvin, Lord Rayleigh, J. J. Thomson, 

 A. Schuster, J. H. Poynting, A. Crum Brown, W. Ramsay, 

 E. Frankland, W. a. Tilden, W. N. Hartley, S. P. Thompson, 

 W. C. Roberts-Austen, A. W. Rucker, A. W. Reinold, Gr. Carey 

 Foster, and H. B. Dixon, Captain W. de W. Abney, Drs. J. H. 

 Gladstone, J. Hopkinson, and A. J. Fleming, and Messrs. W. 

 Crookes, Shelford Bidwell, W, N. Shaw, J. Larmor, J. T. 

 Bottomley, R. T. Glazebrook, J. Brown, E. J. Love, and 

 John M. Thomson, appointed to consider the subject of Electro- 

 lysis in its Physical and Chemical Bearings. 



The document refen'ed to in last year's report as being drawn up by the 

 Rev. T. 0. Fitzpatrick, of Christ's College and Cavendish Laboratory, 

 Cambridge, is now nearly finished, and represents a great amount of labour, 

 for which the best thanks of the Committee are due to the compiler. It 

 consists of a table summarising the results obtained by many experimenters 

 on the electro-chemical properties of solutions in water, and gives, for 

 various concentrations, the conductivity, migration, and viscosity data 

 of a great variety of salts. It will be printed in next year's report. 



The work of the active members of the Committee is proceeding, but 

 it is not in a condition for annual reports. In the opinion of the members 

 present at a meeting held in Edinburgh it was thought best to suspend 

 the official existence of the Committee for a time in order to be able to 

 make a more full and satisfactory report on the progress achieved after 

 the lapse of a few years. Tbey therefore do not at present ask for reap- 

 pointment. 



Report of the Committee, consisting of Professor 0. J. Lodge, 

 Mr. A. P. Chattock, and Professor G. Carey Foster, appointed 

 to investigate the phenomeyia accompanying the Discharge of 

 Electricity from Points. [Draivn up by Mr. A. P. Chattock.) 



During the past year a large number of experiments have been made 

 on the passage of sparks between points and flat plates, especially with 

 regard to the differences exhibited by the two kinds of electricity in this 



