1893. ] NEW YORK ACADEMY OF SCIENCES. 93 
February 6, 1893. 
Recurar Bustyess MEETING. 
Vice-President Dr. Botton in the chair. 
About fifteen persons present. 
The minutes of January 9th were read and approved. 
The following persons were elected Resident Members : 
Pror. Wituiam Hattocr, 
Mr, Detancey W. Warp. 
Mr. Osstan Gururiz, of Chicago, was elected a Corresponding 
‘Member. 
Pror. D. S. Martin announced the death of F. A. Genru, a 
‘Corresponding Member, and remarked on his important contri- 
butions to mineralogy and chemistry. 
ASTRONOMICAL SECTION, 
The Section was called to order at 8:15 Pp. M., Pror. Rees in 
the chair. 
The minutes of the previous meeting were read and 
approved. 
The Secretary called attention to a subscription in aid of the 
memorial to Gauss and Weserr, which is to be erected at 
‘Gottingen, and offered to receive and forward contributions. 
Mr. Jacopy announced that the Rutherford photographic 
measures of the stars surrounding / Cygni showed certain dis- 
cordances which seem to indicate the existence of a large 
parallax for this star. 
The formal paper of the evening was then read as follows : 
A Theory of the Formation of Lunar Craters. 
BY G. K. GILBERT. 
(ABSTRACT, ) 
The theory agrees with the meteoric theories of Proctor, 
Meydenbauer and others in that it ascribes the craters to the 
