1903-4.] 
Meetings of the Society . 
1169 
(c) On the Temperature Observations made in Loch Ness. By 
E. R. Watson, B.A., B.Sc. Communicated by Sir John 
Murray. 
2. On Generalised Functions of Legendre and Bessel. By the Rev. 
F. H. Jackson, H.M.S. Irresistible. Communicated by Dr W. Peddie. 
Trans., vol. 41, pp. 1-28. 
FIRST SPECIAL MEETING. 
Monday , 23 rd November 1903. 
The Rev. Professor Flint, D.D., Vice-President, in the Chair. 
At the request of the Council, Dr Robert Munro gave an 
Address on 
“ Man as Artist and Sportsman in the Palaeolithic Period,” 
( With Lantern Illustrations.) pp. 92-128. 
THIRD ORDINARY MEETING. 
Monday , 7 tli December 1903. 
Dr Robert Munro, Vice-President, in the Chair. 
The Keith Prize for 1899-1901 was presented to Dr Hugh 
Marshall for his discovery of the Persulphates, and for his 
communications on the properties and reactions of these salts, 
published in the Proceedings of the Society. 
The Chairman, on presenting the Prize, read the following 
statement : — 
Persulphuric anhydride was discovered in 1877 by Berthelot, 
but all efforts to obtain persulphates from it were fruitless, and it 
was even asserted, from a theoretical point of view, that per- 
sulphates were incapable of existence. 
When Dr Marshall in 1891 first obtained persulphates by the 
electrolysis of the acid sulphates, they formed a group of salts 
quite unique in character and constitution. Since that time the 
percarbonates (a perfectly analogous series of salts) have been 
prepared in 1896 by Constam and von Hansen, by means of an 
analogous method. 
Persulphates are now made on a manufacturing scale, and have 
taken a place as practically useful substances, being employed 
both in the laboratory and chemical works. 
PROC. ROY. SOC. EDIN. — VOL. XXV. 
74 
