Obituary — Dr. Alfred Ernest Barloiv. 335 



a threefold eruption from a deep source to an intermediate level. In 

 this case, after a partial eruption of the magma at this intermediate 

 level, complete resorption of the barkevikite and some other minerals 

 wouki take place, and the residue would differentiate under the 

 forces of gravity into two portions. An uppei' portion would give 

 rise to the dense non-porphyi'itic phonolites, and the lower portion 

 would provide the basalts. 



The chemical composition of the intermediate lavas, as well as 

 their mineral composition, would suggest that the original magma 

 was that of essexite. It is important to note that in the Island of 

 Tahiti, where there is a similar assemblage of alkaline and basic 

 lavas, the reservoir has been laid bare by denudation and contains 

 essexite as the dominant rock. 



Dr. ALFRED ERNEST BARLOW, 



M.A., D.Sc, F.K.S.Can., F.G.S.A., etc. 



Born 1861. Died May 29, 1914. 



Amongst the terrible loss of life in the St. Lawrence disaster by the 

 sinking of the J^mpress of Ireland, there comes as a shock to all 

 geologists and mining men interested in the occurrence of ore-deposits 

 in the Archaean crystalline rocks of Canada the loss of one who, for 

 the past thirty years, has taken a most active part in the deciphering 

 of the structure of the earth's crust in the great crystalline areas of 

 North America. 



In Dr. Barlow Canada had the last court of appeal on the genesis 

 of its ore-deposits. Trained first at home in Montreal by his father, 

 llobert Barlow, geologist and cartographer under Sir William Logan, 

 of the Geological Survey of Canada, Barlow studied at McGfill 

 University under Sir William Dawson, Dr. Harrington, and other 

 geologists, and was asked to join the technical staff of the Geological 

 Survey of Canada in 1883, at Ottawa, under Dr. A. II. C. Selwyn. 

 Filled with energy and enthusiasm for the science of geology, he 

 entered the field in the province of Quebec, and later on wrought 

 liard in the nickel and copper-bearing deposits of the Sudbury region 

 in Ontario. His work in the area under question is a monograph of 

 the greatest value, and his reports and papers regarding the genesis 

 of the nickeliferous pyrrhotite of the region, and the occurrence of 

 the same in the various tj\)fiS: of crystalline rocks developed during 

 the magmatic ditferentiation which took place are recognized as the 

 best and most natural and practical ti-eatises. In the Cobalt silver- 

 mining district of Ontario, throughout the Lake Temiskaming areas 

 of crystalline rocks, in the iron-ore region of Lake Timagami, as 

 Avell as in the gold-bearing rocks of the Porcupine District, on the 

 Montreal River, and in the Haliburton and Bancroft region of 

 Southern Ontario, throughout the Hastings Series, besides the special 

 district of Dungannon (where corundum deposits are found), Dr. Barlow 

 was the worker who, with unceasing energy and devotion to the 



