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3. Motion of glaciers. (a) Variations:

1. Seasonal.

2. Due to structure of bed.
(6) Theories.
4. Peculiar characters of ice.
Crevasses:

1. Longitudinal.
2. Transverse and marginal.
3. Intersecting.

4. Radial.
5. Glaciers advance and recede.
6. Transporting power of ice.
7. Erosive power of glacier.
8. Moraines.

(a) Lateral.
(6) Terminal.
(c) Median.

REFERENCES.

Dana, Geology, pp. 674–686.
Scott, Geology, pp. 104-116.
Tarr, Elementary Physical Geography, pp. 306–327.
Mill, Realm of Nature, pp. 253–256.
Dryer, Physical Geography, pp. 108–121.

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LECTURE IV.

Volcanoes.

1. Volcanic phenomena in general.
2. Subdivision of the real volcanoes.
3. Stratified volcanoes.
4. Dome-shaped volcanoes.

5. Incomplete volcanoes.

(a) Calderas.
(6) Batholites.

(c) Laccolites.
6. Other evidences of volcanic activity.

(a) Mofettes.
(6) Solfataras.
(c) Fumaroles.
(d) Other sources of gas.
(e) Hot springs.
(f) Mud volcanoes.

(g) Fire fountains. 7. The eruptive act—its premonitions and consequences. 8. Products of an eruption.

(a) Gases and vapors.
(6) Ashes.
(c) Sand.
(d) Larger stones.

REFERENCES.
Dana, Geology, pp. 702-718.
Dana, Volcanoes.
Judd, Int. Sci. Series.
Scott, Geology, pp. 34-60.
Tarr, Elementary Physical Geography, pp. 370-382.
Mill, Realm of Nature, pp. 218–223.
Dryer, Physical Geography, pp. 194–209.

LECTURE V.

Earthquakes.

Relations to volcanic phenomena explained.
Why they occur in other than volcanic regions.

1. Nature of the shock.

(a) Vibratory.

(6) With upward lift. 2. Center of disturbance.

Rate of transmission of vibration.
4. Fissures.
5. Origin of earthquakes.

(a) A sudden blow.
(6) Volcanic outbreak.
(c) Cracking of rock under tension.
(d) Condensation of steam under pressure.

REFERENCES.

Dana, Geology, pp. 741-743.
Scott, Geology, pp. 61-64.
Milne, Int. Sci. Series.
Tarr, Elementary Physical Geography, pp. 382–386.
Mill, Realm of Nature, pp. 223-226.
Dryer, Physical Geography, pp. 190–191.

LECTURE VI.

Geysers.

1. Cause of this form of spring.

Describe Grand Geyser of Iceland as typical geyser. 2. Theories of geyser action:

(a) Descloiseaux.

(6) Bunsen.
3. Yellowstone National Park.

Early accounts.
Describe principal geysers.

REFERENCES.

Dana, Geology, pp. 719–721.
Tarr, Elementary Physical Geography, pp. 386–389.
Mill, Realm of Nature, p. 238.
Dryer, Physical Geography, pp. 106-107.

University Extension Lectures

Syllabus

of a

Course of Six Lectures

on

The Development of Mind

or

The Psychology of Childhood

First Series

Ву

Earl Barnes, A. B., M. S.

Lecturer for the American Society for the Extension of University Teaching

No. 223

Price, 10 cents

Copyright, 1903, by
The American Society for the Extension of University Teaching

South Fifteenth Street, Philadelphia, Pa.

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