History of the Quchec Group. — Hunt. 219 
I proposed to serve as his guide to the more important locali- 
ties, a proposition which he abruptly refused. Advancing 
years and failing health made him unfit to bear any question- 
ing as to the correctness of the views which he had so long 
maintained as to the Green Mountain range, and the conse- 
quence as is known to many, was a severance of the intimate 
and friendly relations of half a life-time and my withdrawal 
in June, 1872, from the geological survey of Canada, after 
more than twenty-five years of service. 
The above conclusions as to the Green Mountain rocks were 
reiterated and enforced at length in my address in August 
1871, as retiring president of the American Association for 
the Advancemeiit of Science, which the reader may consult in 
the published Transactions, and also in my volume of 
Chemical and Geological Essays under the title of "The Geology 
of the Appalachians." It is there said, "Although I have in com- 
mon with most other American geologists maintained that 
the crystalline rocks of the Green mountains and the White 
Mountain series are altered paleozoic sediments, I find on a 
careful examination of the evidence, no satisfactory proof of 
such an origin, but an array of facts which appear to me in- 
compatible with the hitherto received view, and lead me to con- 
clude thatthe whole of our crystalline schists in eastern North 
America are not only pre-Silurian but pre-Cambrian in age." 
These conclusions were arrived at and published while I 
was yet an officer of the geological survey of Canada. They 
were, moreover, explained at length on many occasions to Sel- 
wyn, already in 1870 director of the survey, who was furnished 
with my various publications on the question in 1870, 1871, 
1872, 1876 and 1878, and soon ])egan to investigate the argu- 
ments urged by me against the metamor})hic hypothesis main- 
tained by Mather and by Logan, as to the crystalline rocks of 
the Green Mountain range. The result was that in 1878 I was 
able to write "The investigations of the geological survej' of 
Canada during the years 1876 and 1877, have, according to 
the director of the survey, demonstrated the correctness of 
the view so long maintained by the writer, that the crystal- 
line rocks of the Green Mountain series belong to a more an- 
cient system, which underlies unconformably the uncrystal- 
line Cambrian sediments of the Quel)cc group."" 
'^Azoic Rocks Rep. E., Second Gaol. Survey of Penn., p. 198. 
