36 



FEASEK — ON MAGNETISM. 



calcite* iu my '-Contributions to the Mineralogy of iST. S.," in 

 the " L. E. D. Phil. Magazine," and only name it here in con- 

 nection with economic minerals because it contains almost 

 exactly the same amount of boracic acid as natroborocalcite, 

 and like it would no doubt give a good pottery glaze. I think 

 it would also be found specially adapted for glazing iron vessels, 

 as I find a borosilicate of soda is now preferred to silicate of 

 lead for this purpose, as not affording lead in culinary operations 

 to the contents of vessels so glazed. I found on analysis of the 

 mineral : — 



Water, 



11A]:> 



Lime, 



26JU 



Sulphuric acid, 



80 



Magnesia, 



trace 



Silica, 



15.44 



Boracic acid, 



[44.10] 



100.00 



/Salt from Brine jSprings. Although no deposit of rock 

 salt of any importance has yet been found with gypsum, the 

 brines of the gypsiferous districts, of vdiich some account will 

 be found in a former paper of mine, (Trans. xS. S. Inst., 1<565,) 

 have furnished excellent salt at R. Philip, at Springhill, and 

 Pictou, and a company is now making salt at Antigonish. 



Akt. IV. Magnetism and its Connection with the 

 Telegraph. By Thos. R. Frasek, M. D. 



(Read January 6, 1868.) 



The object of this paper will be to give the philosophy itnd 

 practical working of the Magnetic Telegraph. The term mag- 

 netic is chosen in preference to electric, as commonly used, 

 Magnetism being the 'primanj power or force which causes the 

 magnetic action. Electricitj^ being merely an effect of that 



*Since this paper was written, Piof. Dana, to whom I sent spteiniens of the borates 

 mentioned, has, in the new edition of his ' Mineralogy,' i;ivcn the name of tilesite to 

 natroborocalcite, retained tlie n;inie of crjjitomorphiti.', and ;_'iven the name howlitc to 

 the flew species liere called silicoliororalfiic. 



