176 The Ottawa Naturalist. [December 



wide-spread occurrence of interstratified volcanic material in the 

 Pre-Cambrian rocks. On this point on Feb. 19th, 1891, we find 

 him writing to the late Prof. G. H. Williams : "I have read with 

 much interest your excellent description of the Sudbury rocks. 

 You will perhaps excuse if I make one criticism on the last 

 paragraph, where you observe : 'The rarity of such rocks,' etc 

 If by this you mean the rarity of what I should call ancient 

 volcanic or eruptive ejectamenta, then I think you should rather 

 say : ' The very recent recognition of such rocks by United 

 States geologists.' It is now more than half a century since they 

 were recognized in these ancient formations by British 



geologists Our Huronian is often largely made up of 



volcanic matter originally like those of recent times- -molten, 

 muddy and fragmentary, but now unlike those of recent times 

 all more or less metartiorphic." 



The Logan Club, organized mamly for the purpose of dis- 

 cussing and criticizing results of field work before their presenta- 

 tion to the public in the shape of reports, always received his 

 warmest sympathy and active support, and he was very rarely 

 absent from any of these interesting and instructive fortnightly 

 gatherings. On those nights especially when the subject of the 

 origin of the Archaean rocks was in debate, he was particularly in 

 his element, and although not a petrographer his wide experience 

 in the field in two hemispheres, caused his opinions to be listened 

 to with much attention and respect. 



In this connection, it is a pleasure to state that his classifica- 

 tion of the Archaean given in the Report of 1877-78 i*^, with very 

 slight changes, substantially the same as that favoured by the 

 more recent work. 



His firm and always strongly expressed convictions frequently 

 brought him into dispute and occasional antagonism with those 

 with whom he came in contact, while a hasty temper served at 

 times to accentuate and render difficult of adjustment many of 

 these differences of opinion. 



His friends and geological associates were, however, 

 thoroughly convinced that those he held in highest esteem were 

 those men with whom he had the most frequent and heated argu- 

 ments. In one of his last publications, the address as President 



