Jan. 11, 1894.

My dear Prof. Marsh:

There has been a call for the Ms. of the Denver Basin Report.
You remember that you promised to write for us a short chapter on the
vertebrate life of that region. That is give first, a list of the verte-
brate species you have determined. 1st from the Denver beds, 20 from the
Atlantosaurus beds, and besides this, whatever you may care to say with
regard to the age, climatic conditions, etc. of the periods they represent.
We want to put all the facts as far as ascertained fairly on record.
It is proposed to publish the volume this Spring, and you will confer a
great favor on us if you can send in what you propose to write as soon as
possible. Should there be any unforeseen delay, I will return it to you
for revision, but I cannot go on with my general resume of the work until I
receive it.

DEPARTMENT OF THE INTERIOR

UNITED STATES GEOLOGICAL SURVEY

WASHINGTON, D. C., May 22, 1894.

My dear Prof. Marsh:

I beg to submit the following suggestions for the
chapter you propose to write for us on Vertebrate Paleontology
for the Denver Basin report.

1. Atlantasaurus (Jurassic) beds.

a. Enumeration and brief description of the forms known to have come from these beds in the Denver Basin area, with illustration of some restored types.

b. Reference to the extension of the fauna in other parts of Colorado, in Wyoming and in Montana.

c. General discussion of the character, climatal conditions and affinities of the fauna and their bearing on the age of the enclosing beds.

II. Ceratops (Denver and Arapahoe) beds.

To be treated in the same general way.

As regards illustrations I am informed that it is the present
policy of the Survey to have no paleontologic illustrations in
general monographs, but to confine them to such as are specially
devoted to paleontology. In this case it would be admissible to

use plates already prepared which would assist the descriptions,
but not go into any considerable expense for plates specially for
this volume. Will you kindly let me know when you can probably let
us have your manuscript?

DEPARTMENT OF THE INTERIOR

WASHINGTON, D. C., NOV. 14, 1894.

My dear Marsh:

I am back at work and have the mss for the Denver Basin report nearly ready for the press. I am only waiting now for your notes or contribution on the vertebrate life of the region, and the climatic and other suggestions which they afford, to complete my introductory chapter. Trust you have had as pleasant a summer as I did. Were you at Zurich? If so I envy you that, for it must have been a most pleasant meeting. I have as yet heard from no one who was there.

July 13th, 1895.

My dear Emmons:-

I have your note with the plates returned today,
and write at once in reply.

If you think the table of horizons too extensive for your
work I am quite willing to cut off all below the Trias. Above
that I have myself found fossils or seen authentic specimens from
the Denver region all the way up to recent times, and my plan was
to show in the illustrations something of importance from each
horizon, but especially from three or four of the important ones.
I still think it would be of great interest to show your readers
good figures of the type specimens found in the region you describe
or in the neighboring outcrops of the same horizon. As all the
fossils I shall speak of were land animals I don't see that it
makes much difference how far they were carried down stream or
just where gravity dropped their bones. I can give the facts I
know and then stop without preaching on what might have been.

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CONDITIONS.

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Correctness in the transmission of messages to any point on the lines of the Company can be INSURED by contract in writing, stating agreed amount of risk, and payment of premium thereon at the following rates, in addition to the usual charge for repeated messages, viz: one per cent. for any distance not exceeding 1,000 miles, and two per cent. for any greater distance.

No responsibility regarding messages attaches to this Company until the same are presented and accepted at one of its transmitting offices; and if a message is sent to such office by one of this Company's messengers, he acts for that purpose as the agent of the sender.

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DEPARTMENT OF THE INTERIOR

WASHINGTON, D. C., July 24, 1895.

Prof. O. C. Marsh,

Dear Sir:

On Monday (22nd) I received the following telegram
from you, "I can send you by August first illustrations including
eight or ten restorations of animals from the Denver region with
descriptions of same and brief conclusions, the whole making
chapters of Dozen pages of text and as many plates, provided I
can have a good chance to correct proof. Do you want it. Tele-
graph answer." I did not quite understand why you required
telegraphic answer, as this was what I had been asking you by
letter for the past two weeks, though naturally my desires were
somewhat more fully expressed in my letters than they could be in
a telegram. As regards the proof, you must know that I do not
have the regulating of the proof, but it is the custom of the
Survey to have it submitted to the author. I was sick at home
that day, through being somewhat overcome by the heat so sent my
answer to the Club, where the clerk took the responsibility of
changing your name to Clarsh, in consequence of which it was not
delivered, it appears, until to-day. My answer read "All right,
provided it includes lists of species discovered at different

O. C. M. #2.

horizons in the basin." To-day I am in receipt of the following
telegram from you: "Message just received; will do the best I can
under circumstances. Please send map showing limits of Denver
basin and of region indirectly included in volume."

In response to this I have mailed to you to-day the topo-
graphic base map of our Denver Basin report, which you have doubt-
less seen many times before, as it has been completed now for about
ten years. There is no map of the region *indirectly* included
in report, but the Denver Basin region is spoken of there as
typical of the whole foothill region in Colorado, especially as
regards the development of Mesozoic and Tertiary beds.

I have been thus full in explanation because of your remark
in last telegram about "doing the best you can under the circum-
stances," which *may mean* "delay caused by non-receipt of telegram."
I will also add that the subject of your contribution had already
been spoken of and defined in my letters of Jan. 11, 1894, and
Feb. 5, 1894 (the latter in answer to request for copy of geol.
map of the region) and of May 22, 1894 (giving heading for *your chapters*
sections). Also more recently in letters of July 10, and July
12, 1895, so that you have had ample time for preparation as far
as I am concerned.

Correctness in the transmission of a message to any point on the lines of this Company can be INSURED by contract in writing, stating agreed amount of risk, and payment of premium thereon; at the following rates, in addition to the usual charge for repeated messages, viz, one per cent. for any distance not exceeding 1,000 miles, and two per cent. for any greater distance. No employee of the Company is authorized to vary the foregoing.

Messages will be delivered within the established free delivery limits of the terminal office. For delivery at a greater distance, a special charge will be made to cover the cost of such delivery.

THOS. T. ECKERT, President and General Manager,