W. Huggins on the Spectra of some of the Nebula. 79 
lines very sharp and distinct. They were compared for posi- 
tion with the induction spark. Though this object is bright, 
an indication only of the faint spectrum was suspected. This 
nebula contains probably a very small quantity of matter con- 
densed into the liquid or solid state. The color of the light of 
this nebula is greenish blue. Lord Rosse has not detected any 
central star, nor any perforation, as seen in some of the other 
planetary nebule. He represents it with ans, which probably 
indicate a nebulous ring seen edgeways. 
57 An annular nebula in Lyra; bright; pretty large; 
considerably elongated.|—The apparent brightness of this neb- 
ula, as seen in the telescope, is probably due to its large extent, 
for the faintness of its spectrum indicates that it has a smaller 
intrinsic brightness than the nebulz already examined. The 
brightest of the three lines was well seen. 1 suspected also the - 
presence of the next in brightness. No indication whatever of 
a faint spectrum. The bright line looks remarkable, since it 
consists of two bright dots corresponding to sections of the ring, 
and between these there was not darkness, but an excessively 
faint line joining them. This observation makes it probable 
that the faint nebulous matter occupying the central portion is 
similar in constitution to that of the ring. The bright line was 
27 M. Very bright; very large; irregularly extended. 
Dumb-bell. In Vulpecula.J—The light of this nebula, after 
passing through the prisms, remained concentrated in a bright 
line corresponding to the brightest of the three lines. This line 
appeared nebulous at the edges. No trace of the other lines was 
wet nor was a faint continuous spectrum detected. The 
bright line was ascertained, by a simultaneous comparison with 
the spectrum of the induction spark, to agree in position with 
the brightest of the lines of nitrogen. Minute points of light 
have been observed in this nebula by Lord Rosse, Otto Struve, 
and others; the spectra of these bright pan if con- 
tinuous like those of stars, are doubtless invisible from exces- 
sive faintness. By suitable movements given to the telescope, 
different portions of the image of the nebula formed in the tele- 
