New Haven, Conn.,

December 12, 1888.

I hereby agree to do the following lithographic work for
the United States Geological Survey, under the direction of
Professor O. C. Marsh:

(1) To finish the remaining plates of the Sauropoda volume
as soon as possible.

(2) After this, to finish the remaining plates of the
Stegosauria volume.

(3) To continue the preparation of the sixty ( 60 ) plates
for the Ornithopoda volume, of which nineteen ( 19 ) are now on
stone.

(4) At the same time, or subsequently, to go on with the
sixty ( 60 ) plates of the Theropoda volume, two ( 2 ) of which
are now on stone.

In preparing the plates for the last two volumes, I will
especially have in mind the necessity of making ready at least
forty ( 40 ) plates of each volume, so that when the order for

New Haven, Conn.,

November 8, 1889.

In addition to my work for the United States Geological Survey in accordance with my agreement of December 12, 1888, I further agree to prepare and print the lithographic plates for another volume by Professor O. C. Marsh, to be entitled "Monograph of the Ceratopsidae." This memoir will require not less than twenty plates for the skull alone, and from twenty to forty plates for the remainder of the skeleton. The size of the skull-plates will be large enough (one-fourth natural size) to admit of binding as folio without folding, or quarto when folded.

When two-thirds of these plates are completed, and the remaining drawings essentially done, the author will make a requisition on the United States Geological Survey for publishing the volume.

Witness
T. A. Bostwick.

New Haven, Conn., November 30th, 1890.

Prof. O. C. Warsh,

Paleontologist, U. S. Geological Survey, New Haven.

Dear Sir: -

I hereby acknowledge the receipt of your favor of the
18th inst., informing me that Hon. J. W. Powell, Director of the Geolog-
ical Survey, has authorized the preparation of a Monograph of the
Ceratopsia for publication by the Survey, and also inquiring if I will
undertake the drawing and lithographing of the plates for this volume.

In reply, I hereby agree to undertake this work at once, with the
understanding that the contract be given me when the drawings are so far
completed that the work can be finished within 2 years.