The Royal Society of Canada. 13- 



Prof. McGregor, of Halifax, Nova Scotia, read a paper on the 

 variation of the polarization of electrodes with their difference 

 of potential. 



Prof. Harrington, of McGill University, Montreal, described 

 two species of minerals new to Canada — meneghinite from, 

 Ontario, and tennantite from the Eastern Townships. 



Dr. Ellis presented a specimen of tellurium found in the gold 

 ores of Lake Superior, the first discovery of tellurium in Canada. 



Mr. Baillarge, read a paper entitled " Hints to Geometers- 

 for a new edition of Euclid." 



Dr. Haanel, of Victoria College, Cobourg, communicated a paper 

 on the application of hydriodic acid as a blow-pipe reagent. A 

 new process was described in which this acid is used with a blow- 

 pipe flame on tablets of plaster-of-Paris for determining the 

 character of minerals. A number of water- color drawings were 

 exhibited, showing a beautiful scries of characteristic colored 

 sublimates on these plaster tablets, proving that a large number of 

 elements and even of compound minerals can thus be determined 

 by their action with hydriodic acid. 



Prof. Dupuis, of Kingston, described a mode of construction by 

 which a sidereal clock could be made to show mean time also. 



Capt. Deville read a paper on the measurement of terrestrial 

 distances by astronomical observations, which proposed to substi- 

 tute the difference of azimuths instead of, as usual, the difference 

 of latitudes. 



Mr. Macfarlane read a paper on the reduction of sulphate of 

 soda by carbon. 



Mr. Baillarge contributed papers on the following subjects : On 

 simplified solutions of two of the more difficult cases in hydrogra- 

 phic surveying ; and The measurement of surveys by spherical 

 triangles and polygons on a sphere of any radius ; the latter in 

 the French language. 



SECTION IIII — GEOLOGICAL AND BIOLOGICAL SCIENCES. 



Dr. Selwyn read a paper, entitled " Notes on the Geology of 

 Lake Superior." The points insisted on by Dr. Selwyn were : 

 the conformity of the Laurentian and Huronian divisions of the 

 older crystalline rocks, the Lower Cambrian age of the upper cop- 

 per-bearing rocks of Logan, called Animikie, Nepigonand Kewee- 

 nian by Dr. Hunt, and the unconformity of the Animikie divisions 



