The Monteregian Hills. 205 



portant petrographical relationships observed which have 

 in later times come to be recognized. This early work, 

 however, is of great interest, and in case of three of the 

 mountains almost all the information which we have even 

 at the present time, is derived from those early studies. 

 The results of this work were brought together in the 

 Geology of Canada, published by the Geological Survey 

 of Canada in 1863, and are to be found on pp. 655-70. 

 During the thirty years following the appearance of this 

 volume, only three papers containing additional informa- 

 tion concerning these rocks appeared. These were by 

 Harrington, 1 Lacroix, 2 and the present writer, 3 respect- 

 ively, all dealing with Mount Royal. In 1896 the "Mon- 

 treal Sheet " of the Eastern Townships Map, prepared by 

 Ells, and embracing the district of the Monteregian hills,, 

 was published by the Geological Survey of Canada and 

 accompanied by a geological report on this portion of the 

 province of Quebec. Four years later Principal Dresser 

 of St. Francis College, Richmond, aided by a small grant 

 from the Geological Survey of Canada, made a careful 

 study of Shefford mountain, and a preliminary paper em- 

 bodying the chief results of his investigations appeared 

 in 1901. 4 Mr. Dresser last summer extended his work to 

 Brome mountain, and has since published a brief descrip- 

 tion of this occurrence. 5 Mr. 0. E. Leroy, of McGill Uni- 

 versity, is now engaged in a study of Beloeil, and I am 

 indebted to him for the facts concerning the geology 

 of this mountain which are here presented. Montarville, 

 Rougemont, and Yamaska mountains still await detailed 

 study, but it is expected that they also will before long be 

 put in commission. 



1 " On Some of the Diorites of Montreal," Ann. Rept. of the Geol. Surv. of Can. 

 ada, 1877-78, 42 G. 



2 " Description des Byenites nephelinitiques de Pousac et de Montreal (Canada) et 

 de ieurs phenomtines de contact," Bull. Soc. Gcol. de France, 3e serie, tome XVIII 

 1890. 



3 " On a Melilite-Bearing Kock [Alnoite] from St. Anne de Bellevue near Montreal, 

 Canada,," Amer. Jour, of Science, April, 1892. 



4 "On the Petrography of Shefford Mountain," Amer. Geol., Octoher, 1901. 



5 Summary Report of the Geological Survey Department for 1901, p. 183. 



