452 The American Naturalist. [May, 
PROCEEDINGS OF SCIENTIFIC SOCIETIES. 
National Academy of Sciences.—This body met in Washing- 
ton, D. C., April 17th. The following papers were read. I. Histolog- 
ical Characteristics of Certain Alpine Plants, G. L. Goodale. II. Cor- 
rosions by Roots, G. L. Goodale. III. An Investigation of the Aberra- 
tion and Atmospheric Refraction of Light, with a Modified Form of 
the Loewy Prism Apparatus, George C. Comstock (Presented by $. 
Newcomb). IV. Biographical Memoir of John Le Conte, Joseph Le 
Conte. V. The Coral Reefs of the Bermudas, A. Agassiz. VI. The 
So-called Serpule Reefs of the Bermudas, A. Agassiz. VII. The 
Bathymetrical Extension of the Pelagic Fauna, A. Agassiz. VIII. 
New Method of Determining the Relative Affinities of Certain Acids, 
M. Carey Lea. IX. On the Change of Young’s Modulus of Elasticity 
with Variation of Temperature, as Determined by the Transverse 
Vibration of Bars of Various Temperatures, A. M. Mayer. X. On the 
Production of Beats and Beat-tones by the Covibration of two sounds, 
so high in pitch, that when separately sounded they are inaudible, A. 
M. Mayer. XI. On the Motions of Resonators and Other Bodies 
Caused by Sound Vibrations, with Experimental Illustrations ; abo > 
Reclamation, A. M. Mayer. XII. On Late Researches on the Varia- 
tion of Latitude, S. C. Chandler. XIII. On the Infra-red Spectrum 
S. P. Langley. XIV. The Bacteria of River Water, J. S. Billings. 
XV. The Influence of Light Upon the Bacillus of Typhoid, and the 
Colon Bacillus, J. S. Billings. XVI. Recent Gravity Instruments and 
Results, T. C. Mendenhall. XVII. The Geographical Distribution of 
Fishes, Theo. Gill. XVIII. Note on a Possible Increase in the Ulti- 
mate Defining Power of the Microscope, C. S. Hastings. XIX. The 
Internal Energy of the Wind, S. P. Langley. 
__ No election of members was had. The Academy discussed a p! 
division into classes without reaching a definite conclusion. 
an of 
NaturalfScience?Association of Staten Island, Februry sn 
1894.—Mr. William T. Davis exhibited specimens of the seventee 
year locust found in various years since 1877, and read the following 
paper. 
THE SEVENTEEN YEAR LOCUST ON STATEN ISLAND. 
: — os ear 
Our island will resound, with the rattling song of the seventeen be 
Harvest fly or “ Locust,” during the latter part of next May a? 
