SILICON. 173 



It is reasonable from this circumstance to expect, 

 that the table spar analyzed by Klaproth and 

 Stromeyer should contain a little too much lime, 

 in consequence of the mixture of a small quan- 

 tity of the blue limestone, with the portion of 

 the mineral subjected to analysis. The iron and 

 manganese, small quantities of which were de- 

 tected by Stromeyer, no doubt originated from 

 the garnets. The loss of five per cent, in Klap- 

 roth' s analysis, which he ascribed to water, 

 might possibly be owing to the presence of some 

 blue limestone in the specimen. 



The table spar from Perheniemi occurs in a 

 limestone rock. This might lead to an excess 

 of lime in the specimen analyzed by Rose. That 

 from Pargas was mixed with pargasite and other 

 varieties of horneblende, which might occasion 

 a slight excess of silica in the specimen analyzed 

 by Bonsdorff. 



The iron, manganese, magnesia, &c. which 

 occur in minute quantity in the mineral, may 

 be neglected altogether as foreign matter. We 

 shall attend only to the silica and the lime. 



Let us suppose an atom of silica to weigh 2, 

 and an atom of lime 3'5 ; and let us suppose 

 table spar to be a bisilicate of lime : its constitu- 

 ents would be 



Silica 4. or 53% 

 Lime 3-5 46f 



Now, Klaproth's analysis gives us 



6 



