Mr. M c Cord's Meteorological Summary for Montreal. 285 



orange-coloured body is formed ; its composition is Zn 3 Sb 



+ Zn. 



When the alkaline stibio-sulphuret is added to an excess 

 of the metallic salt, and the whole boiled for some time, a 

 totally different kind of salt is produced. By caustic potash 

 these salts are decomposed into metallic sulphurets and anti- 

 monic acid. The silver salt contains Ag 8 S 8 Sb 2 O 5 ; it may 



be either Ag 3 Sb + 5 Ag, or 8 Ag + Sb. The lead and cop- 

 per salts have the same constitution. With chloride of 

 mercury a white precipitate is obtained ; its composition is 



rig 3 S^b + 3 Hg CI 2 + 3 Hg. 



When arsenio-sulphuret of sodium is added to an excess 

 of sulphate of copper, and the whole boiled, the black inso- 

 luble substance which is formed is sulphuret of copper, Cu S, 

 and in the solution is arsenic acid, containing the whole of 

 the employed arsenic. It is therefore probable that these 

 above-mentioned salts are compounds of the metallic sul- 

 phurets with antimonic acid. (Poggendorff's Annalen, lii. 

 p. 193-242.) 



XL. Meteorological Summary of the Weather at Montreal, 

 Province of Canada, in Lat. 45° 30' N., Long. 73° 22' W., 

 from Registers kept (by J. S. M c Cord, Associate Member of 

 the London Meteorological Society, Member of the Natural 

 History Society of Montreal, Corresponding Member of the 

 Literary and Historical Society, Quebec, and Albany Institute, 

 New York,) for five years, from 1836 to 1840 inclusive*. 



* Reprinted from a table privately distributed by the author, communi- 

 cated by Dr. Daubeny. 



