36 Canadian Record of Science. 



part of the mass to another, and the development of biotite, 

 which is a marked feature in contact zones. Then fol- 

 lows ' feldspathization ' which commences by the develop- 

 ment of little strings of quartz and feldspar, following for 

 the most part the schistosity of the invaded rocks, and 

 which grow in size until the whole mass of schist is 

 transformed into granite, the texture of the schist being 

 broken down and its elements set in motion to form with 

 the transfused material new combinations. The granite 

 magma or emanations thus slowly dissolve, alter, or in- 

 corporate * * * the wall rock, transforming it first into a 

 gneiss, then into a gneissic granite, and finally into' a 

 granite. The original intrusion thus slowly enlarges its 

 boundaries and increases its volume — eats its way into the 

 surrounding rocks and develops itself largely at their ex- 

 pense. 



" This process, we are told, is at work wherever granitic 

 magmas come in contact with clastic rocks in the deeper 

 parts of the earth's crust, and it is thus that the crystal- 

 line schists are produced. " : 



Home 2 and Greenly in Great Britain apparently also 

 reach similar conclusions, and they describe a case where 

 the foliation of an intruding granite is due to a retention 

 of the original foliation of the invaded rock. 



In certain parts of the French Pyrenees are intrusions 

 of granite into limestone, similar in nearly every way, 

 apparently, to those herein described. Lacroix, s however, 

 explains their phenomena by this same theory of " graniti- 

 zation " and " feldspathization ". He claims that the 

 granite dissolves the limestone to form a diorite, and that, 

 so long as the igneous forces continue active, the invading 

 mass advances and enlarges, surrounded by an ever- 



1. Adams, F. D., "Some Recent Papers on the Influence of Granitic Intrusions on 

 the Development of Crystalline Schists ", Jour. Geo], 1897, Vol. V., p. 296. 



2. "On Foliated Granites and their Relation to the Crystalline Schists in Eastern 

 Sutherland", Q. J. G. S., 1896, Vol. LII. 



3. Le Granite des Pyrenees et ses Phenomunes de Contact ". Bull, des Services 

 de la Carte Geol. de la Fiance, No. 64. 



