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University Extension Lectures

No. 221

Syllabus

of a

Course of Six Lectures

on

Physical Geography

By

William Libbey, Sc. D.

Professor of Physical Geography, Princeton University

Price, 10 cents

Copyright, 1903, by

The American Society for the Extension of University Teaching
111 South Fifteenth Street, Philadelphia, Pa.

LECTURE I..

Erosion.

I. Preliminary definitions.

1. What is erosion?

Examples in plastic and granular materials.

2. Where does erosion usually begin?

II. Causes of erosion.

1. Rain.

2. Wind.

3. Heat and cold.

4. Frost.

5. Glaciers and icebergs.

6. Waves.

7. Rivers.

(a) Angle of inclination.

(b) Rate of flow.

(c) Chemical and mechanical effects.
(d) Transporting power of rivers.

1. Causes.

2. How it varies.

(e) Erosive power depends upon:
1. Amount of friction.
2. Geological structure.

III. Results produced.

1. At foot of mountain.

2. In river bed.

3. Overflows.

4. In lakes.

5. Bars.

6. Deltas.

REFERENCES.

Dana, Geology, pp. 637-652.

Scott, Geology, pp. 71–87.

Tarr, Elementary Physical Geography, pp. 231–248.
Mill, Realm of Nature, pp. 231–235.

Dryer, Physical Geography, pp. 210–223.

LECTURE II.

Colorado Canyon: Especial Illustration of Erosion.

1. General idea of section of country in which it is found. 2. The Great Basin.

3. Structure of San Rafael Swell.

4. Periods of depression and deposit.

5. Periods of elevation and erosion.

REFERENCES.

Dana, Geology, pp. 640–641.

Tarr, Elementary Physical Geography, pp. 270, 352, 391.

Mill, Realm of Nature, pp. 247-248.

Dryer, Physical Geography, pp. 81-91.

LECTURE III.

Glaciers.

1. Phenomenon of freezing.

(a) Water.

(b) Vapor-snow crystals.

2. Glacier ice produced by pressure.