432 
Proceedings of Royal Society of Edinburgh. [sess. 
2. Notes on the Dynamics of Cyclones. Part I. By John Ait ken, 
Esq., F.R.S. Trans., vol. 40, pp. 131-148. 
3. Note on the Activity of Saliva in Diseased Conditions of the Body. 
By W. G. Aitchison Robertson, M.D., D.Sc. pp. 155-157. 
The Society at this Meeting adopted the recommendation of the 
Council, intimated to the Society at the Fifth Ordinary Meeting 
on the 15th of February 1900, that the following changes be made 
in the Laws : — ■ 
“ That Law XIV. read — The Ordinary Meetings shall be held on the 
“ First and Third Mondays of each month from November to 
“ March, and from May to July, inclusive ; with the exception 
“that when there are five Mondays in January, the Meetings 
“ for that month shall be held on its Second and Fourth 
“ Mondays.” 
“ That Law XIX. read — An Extraordinary Meeting for the election 
“ of Office-Bearers shall be held annually on the Fourth Monday 
“of October, or on such other lawful day in October as the 
“ Council may fix, and each Session of the Society shall be held 
“ to begin at the date of the said Extraordinary Meeting.” 
“ In Laws XXI. and XXII. read October for November.” 
Mr David Smiles Jerdan, Dr John S. Flett, Mr W. L. 
Sargant, Mr T. Edgecumbe Edwardes, Prof. Edward Albert 
Schafer, and Dr George Archdall O’Brien Reid were 
balloted for, and declared duly elected Fellows of the Society. 
EIGHTH ORDINARY MEETING. 
Monday , 19 th March 1900. 
The Right Hon. Lord Kelvin, G.C.V.O., President, in the Chair. 
The following Communications were read : — 
1. A Development of a Pfaffian having a Vacant Minor. By Thomas 
Muir, LL.D. Trans., vol. 40, pp. 49-58. 
2. The Theory of Alternants in the Historical Order of its Develop- 
ment up to 1841. By the Same. pp. 93-132. 
3. Jacobi’s Expansion for the Difference-Product, when the number of 
elements is even. By the Same. pp. 133-141. 
4. Heat of Combination of Metals in the Formation of Alloys. By 
Alexander Galt, D.Sc. 
