186 TRANSACTIONS OF THE [APR. 3 
Journal, December 17, 1892, p. 581; the Scientific American, 
December 31, 1892, p. 423; the School of Mines Quarterly, 
January, 1893, p. 93, with two steel portraits, one taken in 1865 
and one in 1887; the Bulletin of the Torrey Botanical Club, 
March, 1893, with an artotype ; and the Bulletin of the Geo- 
logical Society of America, Proceedings of the Ottawa Meeting, 
December, 1892, also with an artotype. A memorial, by Profes- 
sor J. J. Stevenson, is to appear in the American Geologist for 
July, 1898, with a revised chronological bibliography by J. F. 
Kemp. 
April 3, 1893. 
Reeutar Bustvess MeEerina. 
President Borron in the chair, and twenty-seven persons 
present. 
SECTION OF ASTRONOMY AND PHYSICS. 
A paper was read by Professor Wituram Hattock entitled 
“Investigations of the Temperature of the Earth’s Crust.” 
This paper gave an account of temperature measures made at 
Wheeling, W. Va., in a dry well 4,500 feet deep. These meas- 
ures, when plotted, showed a small but distinct variation from 
uniformity in the rate of increase of the earth’s temperature. 
The results have been described in Proc. Am. Assn., Vol. XL., 
p. 257 ; and Am. Journ. Sci., March, 1892. 
Mr. Tatlock then read a note on the place of A Ursz Minoris, 
calling attention to the bearing upon the subject of Dr. Eixry’s 
recent heliometric triangulation of close polar stars. The 
matter was further discussed by Professor Sarrorp and Mr. 
J ACOBY, 
Professor Sarrorp read a paper entitled, ‘‘ The Construction 
of a Catalogue of Standard Polar Stars.’’ The paper dealt 
with the various peculiar difficulties attending the observation 
of close polar stars, as well as the complexity and great length 
of the resulting computations. The author referred to his own 
