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TABLE OF CONTENTS.

PAGE.

Stated Meeting, July 19 ....

1

Stated Meeting, August 16 .

1

Stated Meeting, September 20.

2

Stated Meeting, October 4..

3

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

Charles A. Ashburner...

9

Nature's Reforesting. By Eli K. Price..

26

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

one Plate)....

29

Crucial Harmonies. By Pliny E. Chuse

34

Stated Meeting, October 18...

37

Overtones heard in a Telephone Experiment. By Persifor Frazer, Jr. 39

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

41

Stated Meeting, November 1...

43

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

Saltler ...

44

On the Electrotype Estimation of Cadmium. By Edgar F. Smith... 46

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

47

Circumstances Influencing the Efficiency of Dynamo-Electric Ma-

chines. By Edwin J. Houston and Elihu Thompson.

58

Siated Meeting, November 15

61

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

Edward D. Cope.

03

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

Waterloo. By Henry Phillips, Jr

Stated Meeting, December 6

83

The Glacia! Moraine of Northampton Co. Pa. By Frederick Prime, Jr. 84

Stated Meeting, December 20....

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)....

96

On the Total Solar Eclipse of July 29, 1878. By George F. Barker, 103

On the Dolomite Limestones at Harrisburg. By J. P. Lesley. (To

be concluded in No. 103).

114

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