glass-factory now in successful operation near Vau- 

 dreuil, a few miles west of Montreal. 



The various refractory materials required for the 

 construction of furnaces, and for smelting metals 

 are not wanting in Canada. In many parts of the 

 Laurentian region PLUMBAGO or black lead is found 

 of a superior quality for the manufacture of cru- 

 cibles, 



. SOAP STONE. 



Soapstone which is used not only as a lining for 

 furnaces, but in the United States for the construc- 

 tion of stoves for domestic purposes, abounds in 

 the Eastern Townships ; while sandstone for the 

 hearths of furnaces, fire-clay, and moulding-sand are 

 found in many parts of the province. 



MICA. 



Mica, w r hich now finds so many applications in the 

 arts, exists in the Laurentian region of Canada in 

 abundance, and of an excellent quality. Thin sheets 

 of the mineral of very large sizes are obtained, and 

 it is already an article of export. 



As materials for millstones, varieties of granite, 

 and of hard quartzite rocks are made use of in va- 

 rious parts of the province ; and in Grenville on the 

 Ottawa a variety of silex precisely resembling the 

 French buhrstone is found. Grindstones are made in 

 many parts of western Canada from a sandstone 

 well fitted for the purpose, while whetstones and 

 honestones, some of them of superior quality, are 

 found in a great many parts of the country. 



Superior stones for the purpose of lithography 

 have been found in several localities in western 

 Canada ; but although trials have shown them to be 

 of an excellent quality, they have not yet been 

 brought into use. 



