POPULAR SCIENTIFIC LECTURES.

Prof. JOHN D. PARKER, Ph.D., B.D.,

Is prepared to deliver either Single, or a Course of Lectures, on topics connected with Physical Science, before Library, or Lecture Associations. These lectures discuss subjects of the highest interest, and are illustrated by diagrams, and black-board sketches.

He is also prepared to deliver a special Course of Class-Lectures on Meteorology before our higher institutions of learning.

He may be addressed for terms and particulars at Topeka, Kansas.

Geological Circular.

ALLOW me to call your attention to the importance of Geology as a science, and to enlist your co-operation in gathering and preserving *fossil specimens* of every description. Geology is that science which investigates the formation and mineral constitution of the earth, and treats of the successive physical changes that have taken place in the various kingdoms of nature. The crust of the earth about fifty miles deep, with the exception of a few feet of surface soil, is composed of various layers of solid rock. Nearly one-fifth of the upper portion of this rock is *fossiliferous*, or contains *petrifactions*, of ancient marine and land animals. The layers of this fossiliferous rock, are generally broken by internal forces, and inclined to the perpendicular, which brings their edges to the surface, forming *outrops*, and rendering their fossils accessible. These fossils determine the character of the rock in which they occur, being the language in which geological records are written; and are of the highest scientific value. They can be broken from the rocks of almost every quarry, and if preserved they would be of great value in making out the geology of the State.

The undersigned is desirous of securing the attention of teachers and friends of Natural Science in our State, to this subject, and of procuring their co-operation in obtaining fossil specimens of every description. Specimens should be labeled so as to preserve a knowledge of their locality.

Geology is one of the most delightful studies in the whole range of science, ranking next to Astronomy in its marvels and bearing upon our planet; and has claims upon the attention and study of every intelligent being. We are living and moving among the wonders of the past, and occasionally a few leisure hours can be profitably employed in gathering the materials of Natural Science, and in deciphering the records of past ages.

JOHN D. PARKER,
PROF. OF NATURAL SCIENCE,
Lincoln College, Topeka, Kansas.

POPULAR SCIENTIFIC LECTURES.

Geological Circular.

ALLOW me to call your attention to the importance of Geology as a science, and to enlist your co-operation in gathering and preserving *fossil specimens* of every description. Geology is that science which investigates the formation and mineral constitution of the earth, and treats of the successive physical changes that have taken place in the various kingdoms of nature. The crust of the earth about fifty miles deep, with the exception of a few feet of surface soil, is composed of various layers of solid rock. Nearly one-fifth of the upper portion of this rock is *fossiliferous*, or contains *petrifications*, of ancient marine and land animals. The layers of this fossiliferous rock, are generally broken by internal forces, and inclined to the perpendicular, which brings their edges to the surface, forming outcrops, and rendering their fossils accessible. These fossils determine the character of the rock in which they occur, being the language in which geological records are written; and are of the highest scientific value. They can be broken from the rocks of almost every quarry, and if preserved they would be of great value in making out the geology of the State.

FACULTY.

H. Q. BUTTERFIELD, A.M.,
Latin and Greek Lang's.
JOHN D. PARKER, Ph.D.,
Natural Science.
JOHN A. BANFIELD,
Preparatory Department.

Instructors.

PERLEY M. GRIFFIN, J. B. BILLARD

Lincoln College.

Tuition Free To Candidates for the Ministry,
Union Soldiers honorably discharged, and
Children of Home Missionaries of all Evangelical Denominations.

Topoka, Kansas, Jan. 30th, 1869,

Prof. O.C. Marsh:

Dear Sirs:

Your favor came duly
with the others. I am only confirmed
in my previous opinion. I prove
(12) perfect vertebrae have been found.
They appear together in one of the
photographs. Several others are in
the matrix. Your photographs
include all the best positions. There
is a large mass of the broken
remains filed in boxes and barrels,
Dr. Nebb of this city owns the fossil,
He first declined to sell at all. Per-
haps he will sell but has set no
price. I believe. It will be high. The
fossil was found near Sheridan on
the U. S. P. R. R. E. D., I suppose that it
is in the Cretaceous, I tried to secure
the fossil for you without success.

Mosasaurus.
An, Feb. 16th.

B. F. MUDGEE
F. E. SNOW,
J. S. CARRUT,
J. H. CARRUT,
MAY. F. HAW
J. A. BANFF
J. E. ROBINSON
S. E. SHIELD
JOHN D. FAR
specimen &
&

BENJAMIN
JOHN D. P.
~~Chairman~~

KANSAS NAT.
1072

Dr. Nebb has given me a chance to write to you after having read your article in the local paper.

FACULTY.

H. Q. BUTTERFIELD, A.M.
Latin and Greek Lang's.
JOHN D. PARKER, Ph.D.
Natural Science.
JOHN A. BANFIELD,
Preparatory Departm't.
Instructors.
PERLEY M. GRIFFIN, J. B. BILLARD

Washburn, (formerly Lincoln) College.

Topeka, Kansas, M'ch 17, 1869.

Prof. O. C. Marsh:

Dear Sir:

Before your last letter arrived the Mosasamus was sold to Agassiz for $500. It was so badly broken that I hardly think that you will regret it. I presume now it will be figured and described. I can send you one of those two bi-concave vertebrae by express. They are alike. The other is promised to Prof. Cope, Phila. My salary is small and so slowly paid that I cannot afford the Am. Journal of Science. Cannot I serve you some way as your western correspondent so that you could afford to send if to me?

Very Truly Yours,

Ina. D. Parker.