1894. | NEW YORK ACADEMY OF SCIENCES. 205 
The second paper was by J. F. Kemp. Notes ofa Trip to the 
Iron Mines at Cornwall, Pa., and the Nickel Mine at Lancaster 
Gap, Pa. The paper was illustrated by the lantern and exten- 
sive suites of specimens and was discussed by Prof. Martin. 
On motion the Academy adjourned. 
J. F. Kemp, 
Recording Secretary 
. 
“ 
REGULAR Business MEETING. 
May ‘th, 1894. 
The meeting was called to order by President Ress, fifteen 
persons being present. The minutes of the last meeting were 
read and approved, Prof. Hallock acting as Secretary. 
The Section of Astronomy and Physics then organized, The 
first paper of the evening was by Prof. R. 8. Woodward on 
‘Periodic Errors of Graduated Circles.” The second paper 
was by Prof. Hallock on “ The Photography of the Manometric 
Flames in the Analysis of Articulate Sounds.” The paper was 
discussed by Profs. A. E. Mayer and Pupin. 
The last paper of the evening was by Prof. Rees on “ Solar 
Facule shown in Rutherford’s Photographs of 1870-71.” Prof. 
Rees called attention to the remarkable work now being done by 
Prof. Hale, of Chicago, in showing by the aid of photography 
the existence of faculs in great numbers over the sun’s surface. 
He stated that he exhibited to Prof. Hale when on a visit to 
New York city, some time ago, several of the originals of 
Rutherford’s photographs of the sun, and pointed out the beau- 
tiful showing of the facule profusely scattered over the sun’s 
surface. Rutherford produced negatives of the sun showing 
the solar faculz and the mottled surface long before Jansen, of 
Mendon, who is generally credited with being the first to pro- 
duce such negatives. A number of lantern slides, made from 
Rutherford’s negatives, were shown, and the great numbers of 
