OF THE

AMERICAN PHILOSOPHICAL SOCIETY

115-133

HELD AT PHILADELPHIA

FOR

PROMOTING USEFUL KNOWLEDGE.

Vol. XVIII.

JULY 1878 TO MARCH 1880.

PHILADELPHIA :

PRINTED FOR THE SOCIETY

BY M'CALLA & STAVELY.

1880.

122.7

LSoc4685.106

FEB171679

OF THE

FEB17 1879

Oil Well Records in McKean and Elk Counties, Pennsylvania. By

Charles A. Ashburner...

Nature's Reforesting. By Eli K. Price.

Preliminary Notice on Chromometry. By George A. König. (With

Overtones heard in a Telephone Experiment. By Persifor Frazer, Jr.

The Limiting Constant of Gravitation. By Pliny E. Chase...

Stated Meeting, November 1......

39

41

43

The Presence of the Higher Olefines in Petroleum. By Samuel P.

Sadtler......

On the Electrotype Estimation of Cadmium. By Edgar F. Smith...

On the Scales of Maps. By Lewis M. Haupt..

Circumstances Influencing the Efficiency of Dynamo-Electric Ma-

chines. By Edwin J. Houston and Elihu Thompson.

Stated Meeting, November 15.

On Some of the Characters of the Miocene Fauna of Oregon. By

Edward D. Cope...

63

Descriptive List of Medals s'ruck to Commemorate the Battle of

Waterloo. By Henry Phillips, Jr...

78

Stated Meeting, December 6

83

The Glacia! Moraine of Northampton Co. Pa. By Frederick Prime, Jr.

Stated Meeting, December 20...

84

87

Movements of Troops in Cities in cases of Riot or Insurrection. By

Russell Thayer......

89

On the Physical and Chemical Characteristics of a Trap. By Persi
for Frazer, Jr. (With a Colored Plate)...

On the Total Solar Eclipse of July 29, 1878.

On the Dolomite Limestones at Harrisburg.

be concluded in No. 103) ..