No. 1.] NATURAL HISTORY SOCIETY. 59 



The foregoing acids and bases are most probably combined in 

 the water as follows : 



(Carbonates calculated as mono-carbonates and all the salts estima- 

 ted as anhydrous.) 



Chloride of sodium 3.277 5.589 



.Sulphate of potassa 0.923 1.015 



*' of soda 8.216 4.727 



" of lime — 6.739 



Carbonate of lime 1 2. 11 2 7.388 



" magnesia 9.635 10.798 



"o' 



1. — Although here given as ferric oxide, the iron was doubtless 

 present in the water as a ferrous salt. — 2. Direct method, "VVanklyn 

 and Chapman. 



In the case of the Assiniboine water there was an excess of soda, 

 above that required for the sulphuric acid, amounting to 0.114 

 grain (equals 0.084 sodium) — this might be present as carbon- 

 ate: it would require 0.129 chlorine or 0.147 sulphuric acid in 

 excess of the amounts found of these respective constituents. It 

 has been calculated as, and added to the, sulphate of soda. 



PKOCEEDINGS OF THE NATURAL HISTORY 



SOCIETY. 



The fifth regular meeting of the session 1880-1881, was held 

 on the evening of Monday, March 28th. Principal Dawson 

 occupied the chair. 



The Sommerville Lecture Committee presented their report, 

 which stated that the lectures had been a great success and more 

 largely attended than in the past years. 



The Chairman read the following iuterim report of the com- 

 mittee of council on the proposed meeting of the American 

 Association for the Advancement of Science in Montreal in 

 1882 :— 



The Committee having met on Monday, March the 14th, re- 

 quested Dr. T. Sterry Hunt to prepare a circular to be printed 

 and eent to scientific men abroad, inviting them to attend the 

 meeting : copies of this circular to be furnished to members of 

 the Society and others willing to send them to their scientific 

 friends. 



It was further aejreed to recommend that the President of the 

 Society, Dr. Hunt, Mr. Selwyn and Dr. Osier, with any other 



