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BUILDING STONES OF OHIO. 
From ADVANCE SHEETS OF THE REPORT OF THE TENTH CENSUS OF THE UNITED 
Srates on “ BurtpInG STONES AND THE QUARRY INDUSTRY.” 
[BY PERMISSION.] 
[The data for the following report upon the Building Stones and the Quarry In- 
dustry of Ohio were gathered in 1880 for the Tenth Census of the United States, 
under my supervision. The facts thus accumulated have been made the subjects of 
caretul study and arrangement by the appropriate department of the Census Bureau, 
and the report prepared on this basis is soon to be issued by the General Govern- 
ment. The plan and proportions of this and allied reports were determined by Dr. 
George W. Hawes, the special Agent in charge of this division of the Census work 
and Curator of Economic Geology in the Smithsonian Institution, and much of the 
labor in preparing it was done by him. For such a task, few men in the country 
were better fitted by natural taste and by acquired knowledge. A recognized author- 
ity in lithology, familiar with all the modern methods of inquiry in this field, he has 
enriched his reports with a considerable amount of special information that is new 
in kind to the general reader, and that cannot fail to prove stimulating and suggestive 
to many of our students of practical geology. The work of Dr. Hawes was arrested 
while still incomplete by his untimely death, but it has been carried forward, chiefly 
by trusted assistants that he had trained, two of whom went from Ohio and one of 
whom has been since employed in the Geological Survey of Ohio, viz., F. W. Sperr, 
M.E. A considerable part of the Census Report on Ohio Building Stones was put 
in shape by Mr. Sperr, by whom also the geological facts were in large part collected. 
The chapter is thus largely of his authorship. 
The courtesy of Hon. (. W. Seaton, Superintendent of the Census, allows me to 
use the advance sheets of this report in the present volume. When published by 
the Government, but a few hundred copies at most will be assigned to Ohio, and its: 
usefulness will thus be greatly restricted, but its adoption in the present volume en- 
sures its wide distribution among those that can turn to the best account the valuable 
information that it contains. 
As has been already stated, its materials were gathered under my personal super- 
vision and have been largely put into shape by one of my assistants, by which facts 
it is connected closely enough with the Survey, while at the same time, the respon- 
Oo” G. 
