viil | PREFACE. 
the value of the results of the Survey until all this matter shall have been submitted 
to them in printed form; but the degree of favor with which tbe reports already pub- 
lished have been received, will perhaps be accepted as proof that the work of the 
_ Survey has been, and is being satisfactorily done, and that when finished it will not be 
discreditable to those engaged in it orto the State. Ibis but just, however, to the mem- 
bers of the Geologica: Corps, to state that they do not regard their work as in any sense 
exhaustive and complete, but as at least a fair return for the time it has oceupied, and 
the money axnended uponit. To make a minute and thorough survey of a great and 
rich state like ours, would require a very large sum and many years of time, but the 
present survey was begun with a guaranty of only three years’ continuance. Although 
‘subsequently extended by act of Legislature, no provision was made for its support 
in vigor and activity for more than five years; and whatever has been done since the ex- 
piration of that period has been largely as a gratuity on the part of those who accom- 
plished it. When the materials collected by the Survey shall all have been worked up, 
the total expenses of field and office work will amount to about: $100,000, asum which 
will not appear xiravarent when if is known that for the field and office work of the 
Second Geological Survey of oun neighboring State, Pennsylvania, $350,000 have 
already been appropriated. | 
The cost of: the publication of the reports of the Ohio Survey has been large, because 
they have been issued in editions of 20,000 copies ; but tor that expenditure the Geolo- 
gical Corps is not responsible, since ib was made by independent and unsolicited action | 
of the Legislature. , | / 
In the preface to Vol. II, Geology, an explanation has been given of the differences of 
the volumes of the report in size and in the quality paper used. For these differences 
and for the fact that the typographical execution in style and accuracy leaves much to 
be desired, the Geological Corps is not accountable. The errors in typography are such 
as are incident to the wholesale and hurried manner in which our public documents are 
printed. | ! 
The proof reading and also a measure of editorial supervision of the present volume 
have been turned over to Prof. Edward Orton, but in justice to him it must be stated 
that it has occasionally been found necessary to print one or more forms during his 
absence from home. For the errors occurring in such forms he is not responsible. It 
has not been possible, in any case, to send away proofs of the reports to their several 
authors for revision. | 
ASN 
