THE GRANITES OF MAINE. 
By T. Nelson Dale. 
INTRODUCTION. 
The success of an industry that deals directly with any natural 
material must involve sooner or later, at some poh t, a knowledge of 
the laws pertaining to that material. Moreover, persons engaged in 
such an industry are led by their very occupation to seek, with an 
interest that is in proportion to their intelligence, an explanation of 
the phenomena that daily come before them. For these reasons it lias 
been the writer's aim to make the following report both economic and 
scientific. Indeed, its scientific part forms to a large extent the' basis 
of its economic part. In the scientific discussion the presentation is 
succinct. Details that are of interest to the scientific specialist alone 
have been omitted or very briefly summarized, and technical terms 
have been, as far as possible, avoided. Such scientific terms as have 
been necessarily used are explained in the glossary at the end of the 
report, where, also, some of the quarrymen's terms are given and 
translated for the benefit of the general reader. 
For the general geological knowledge that underlies this report the 
writer is indebted to a considerable body of scientific literature. The 
works of Archibald Geikie, G. P. Merrill, Julien, A. Rosiwal, Buck- 
ley, and Watson have been carefully consulted. Other authorities 
for particular facts or theories will be named at the proper places. 
The design is to present the subject in the light of present science and 
in simple form. 
The material for the local details and descriptions given in this 
report was collected in three months in 1905, during which time the 
writer visited 129 quarries and prospects. Although the complexity 
of the subject would have justified more extended research at the 
quarries, it was for several reasons impracticable to extend the 
season's field work. 
Mr. Albert Johannsen, of the United States Geological Survey, 
has verified or corrected the writer's microscopic determinations of 
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