1893.] NEW YORK ACADEMY OF SCIENCES. 93 



February 6, 1893. 



Eegular Business Meeting. 



Vice-Presicleut Dr. Bolton in the chair. 



About fifteen persons present. 



The minutes of January 9tb were read and approved. 



The following persons were elected Resident Members : 

 Prof, William Hallock, 

 Mr. Delancey W. Ward. 



Mr. Ossian Guthrie, of Chicago, was elected a Coi*respondiug 

 Member. 



Prof. D. S. Martin announced the death of F. A. Genth, 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 p. m., Prof. Rees in 

 the chair. • 



The minutes of the previous meeting Avere read and 

 approved. 



The Secretary called attention to a subscrijition in aid of the 

 memorial to Gauss and Weber, which is to be erected at 

 Gottingen, and offered to receive and forward contributions. 



Mr. Jacoby annovinced that the Rutherford photographic 

 measures of the stars surrounding /3Cygn\ 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 io the 



