bo 
IO 
New Star in Centaurus, 1895. 
. Spectra of Stars in vicinity of 7 Carine. 
Spectra of Stars in cluster in Carina [N. G. C. 3532]. 
Discovery of new variable stars from their spectra. 
New Algol variable in Delphinus. 
Light curves of variable stars. 
. PHotocrapus of Planetary Spectra made with the Spectro- 
scope of the Allegheny observatory. Exhibit of Prof. J. 
E. Keeler, Allegheny, Pa. 
These photographs were made either for the purpose of 
determining the relative motion in the line of sight of dif- 
ferent parts of the surface of a planet, or for determining 
whether it is possible to detect the existence of an atmos- 
phere around a planet by absorption lines in its spectrum. 
bo 
Spectrum of Jupiter, region of Hy, October 16, 1892. 
No comparison spectrum. 
Spectrum of Jupiter; region of yellow green, February 
24, 1895. Sky spectrum for comparison. Original 
negative. 
The obliquity of the planetary lines is due to the rota- 
tion of Jupiter. 
ae 
4. 
Positive Copy of (2). 
Spectrum of Jupiter; region of D, February 26, 1895. 
Sky spectrum for comparison. 
This spectrum extends far de/ow the principal water- 
vapor band 0, which, however, does not appear on the 
photograph, as the negative was developed for the D 
lines. 
C1 
“I 
Spectrum of Saturn; focus on 45352. April 9, 1895. 
Lunar comparison spectrum. Original negative. First 
measurement of relative velocities in the system of 
Saturn. (Astrophysical Journal, May and June, 1895.) 
Spectrum of Saturn, April 28, 1895. Positive copy. 
Spectrum of Venus, April 23, 1895, with simultane- 
ously photographed sky spectrum. The planetary 
lines are displaced slightly toward the violet by the 
approaching motion of Venus. 
