124 TRANSACTIONS OF THE [May 9, 
Further Experiments in Connection with Vacuum Discharges. 
Dr. Puptin’s paper was illustrated by photographs of experimental 
and actual corona of the sun. 
Dr. Bourton asked what were the gases he introduced into the 
vacuum flasks, and suggested that certain gases might produce light 
more easily photographed, provided the mechanical effects sought 
were secured. 
Dr. Purtn said he used ordinary air and alcohol vapor, the latter 
giving a very white light. 
Pror. Rees spoke of the opportune character of Dr. PuPin’s re- 
searches in their bearing on the theory of Schiberle. 
Mr. J acosy exhibited a negative of the stars surrounding 6-Cygni, 
which had been taken at Columbia College Observatory, April 19, 
1892. A comparison of this negative with the results deduced 
from Mr. Rutherfurd’s negatives of the same stars showed that the 
discrepancies between the latter and Argelander’s Durchmusterung 
were due partly to omissions in the Durchmusterung and partly 
to insufficient sensitiveness of Mr. Rutherfurd’s plates. Attention 
was particularly called to the stars numbered 27 and 28 in Mr. 
Rutherfurd’s list. These two form a double on the Rutherfurd 
plates; and while they are plainly separated on the latter, on the 
‘Columbia College negative the image of the smaller star appears as 
a sort of elongation of the larger star image. This appearance 
may, however, be due to the enlargement of the images upon the 
very sensitive dry plates. 
Vice-President Botton resumed the chair, and the Academy 
adjourned. 
May 9th, 1892. 
STavTeD MEETING. 
Pror. J. K. Rees in the chair. Sixty persons present. 
The minutes of April 25th were read and approved. 
Morris Logs, Ph.D., of the University of the City of New York, 
was proposed as a Resident Member by Dr. H. Carrinaton Bouton; 
the nomination was referred to the Council. 
The Secretary read the following papers by title :— 
eee ee 
