A. A. A. S. MEETING

A special meeting of the American Association for the Advancement of Science was held at Dartmouth June 30—July 2. The papers read June 30 were as follows:

Light Pressure on Black Surfaces and on Thin Plates of Glass. (With experimental demonstration.) G. F. Hull, Dartmouth College.

Demonstration of J. J. Thomson's Cloud Experiment and other Electron Experiments. G. F. Hull, Dartmouth College.

Changes in Density of the Ether. (With lantern.) Charles F. Brush, Cleveland.

Some Optical Effects of Changes in Ether Density. (With lantern.) (15 min.) Charles F. Brush, Cleveland.

On Oscillations in the Metallic Arc. W. G. Cady, Wesleyan University.

A Study of Overcast Skies. Edward L. Nichols, Cornell University.

The Influence of Temperature on the Fluorescence of Uranium Glass. R. C. Gibbs, Cornell University.

Some Electrical Properties of Silicon. Frances G. Wick, Cornell University.

Coefficients of Expansion at Low Temperatures. H. G. Dorsey, Cornell University.

A Study of Short Time Phosphorescence. C. W. Waggoner. Cornell University.

An Experimental Study of the Recovery of Selenium Cells. L. S. McDowell, Cornell University.

Electromagnetic Mass and Energy. Daniel F. Comstock.

A Comparative Investigation of Dispersion and Electric Double Refraction in Liquids. H. E. McComb, University of Nebraska.

Effect of Absorbed Hydrogen and of other Gases on the Photo-electric Activity of Metals. V. L. Chrisler, University of Nebraska.

A New Method for Determining the Difference of Potential between a Metal and a solution of one of its Solids. A. W. Ewell, Worcester Polytechnic Institute.

Local Geology of Hanover, N. H. C. H. Hitchcock, Hanover, N. H.

The Altitude of the Algonquin Beach ; and its Significance. J. W. Goldthwaite, Hanover, N. H.

Changes in the Recession of the Falls of Niagara. J. W. Spencer, Washington, D. C.

Preglacial Erie Outlet. J. W. Spencer, Washington, D. C.

The Warm Stratum existing at a great height in the Atmosphere. A. Laurence Rotch.

Recent Explorations in Mammoth Cave. Horace C. Hovey.

High-level Terrraces of New England. J. W. Spencer.

Studies of the Tracks of Climatichnites. C. H. Hitchcock and W. Patten.

Tuesday evening, June 30, Prof. J. W. Spencer of Washington gave an illustrated lecture on "The Spoliation of Niagara," and the following evening Dr. T. S. Palmer of the University of Chicago spoke on "The American Bison." Wednesday the scientists visited Mt. Ascutney, and Thursday the Blue Mountain game preserve.