INTRODUCTORY LETTER.


                 CHEMICAL LABORATORY OF THE
             KENTUCKY STATE GEOLOGICAL SURVEY,
                      LEXINGTON, KY., April i9th, 1875.
Professor N. S. SHALER, Chief Geologist, Cc.:
DEAR SIR: I have the pleasure herewith to report the
results of the chemical work performed in this laboratory, for
the State Geological Survey, since September, 1873, to nearly
the present date. So much could not have been effected but
for the able and efficient assistance of Mr. John H. Talbutt,
who has given his constant attention to this labor.
                    Very respectfully,
                                   ROBERT PETER.
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