236 Canadian Record of Science. 



Feldspar - - - 77-24 per cent. 



Nepheline - - - 4.40 



Hornblende - - - 5.37 



Biotite - - - - 7 - 08 



Iron ore - - - 1.81 



Sphene - - - - 3.29 



Apatite- ... .81 



100.00 



For purposes of comparison the analysis of the pulaskite 

 (No. VIII) and of the nordmarkite (No. IX) of Shefford 

 mountain were calculated into their respective norms and 

 the position of these rocks in the new system of classifica- 

 tion determined. The pulaskite (No. VIII) is found to 

 have the following position : 



Class 1, persalane. 

 Order 5, canadare. 

 Rang 2, pulaskase. 

 Subrang 4, laurvikose. 



The nordmarkite (No. IX), however, is peralkalic and 

 must be classified as follows : 



Class I, persalane. 

 Order 5, canadare. 

 Rang 1, nordtnarkase. 

 Subrang 4, nordmarkose. 



It, however, lies just on the line between nordmarkose 

 and phlegrose, and might thus be best termed a nordmar- 

 kose-phlegrose. 



It is thus seen that the rocks from Mount Johnson and 

 from Shefford mountain which, following Rosenbusch's 

 classification, have been called pulaskite, and which in 

 this new scheme of classification are pulaskase, are almost 

 identical in composition with one another and with the 

 Norwegian laurvikite, and the nordmarkite of Shefford 

 mountain is very close in composition to the nordmarkose 

 of the original Scandinavian locality. 



Diagrams showing the composition of these several 

 rocks are presented in Fig. 4. 



