i88 4 .j 
in the Spectra of Fixed Stars. 
48l 
Sin” 0 !? 1 ’ 67 '" 5 ’ a PP arentI y- any regular period, nor de- 
An & a meie increase or decrease of temperature. 
, C asl n r al a PP 5 a r rance of bright lines in the spedtrum of 
thp P -p 6 and ^ Lyrae Seems first t0 have been noticed by 
Hno-ainQ . 1 v0 ^ n astr °nom er Secchi. Subsequently Mr. 
antfn Vri n f‘ fied !> n 7 p T assi0 P ei ® tb e bright lines H a , H^, 
onfv^T iVr l8 ?? Herr Vo - el could s ee and measure 
in th! 5 ngh m 1 ? e Hf3 ■ He furtber suspected a bright line 
n the yellow (D 3 ), and found only a few dark lines in the 
In tbe s Pea:rum of /3 Lyrm the same physicist mea- 
ured, in 1871, three bright lines identical with H 0 , EL and 
3 . Subsequently these lines became so faint that thev 
could be perceived only by the aid of especial artifices. 
fvem. 11 different successive evenings they appeared of dif- 
w^^ ntenS ^' Whl > h 1 could not be brought in connexion 
\wth the conditions of the atmosphere. 
Subsequently these bright lines seem to have disappeared 
entirely , for though they were repeatedly sought for at the 
Observatory of O’Gyalla they were not seen from 1874 until 
1882. Herr Eugen von Gothard frequently examined these 
interesting stars spectroscopically since the opening of his 
Observatory, in the autumn of 1881, but without effeft. In 
1882, on July 24th and August 7th, he could distinguish in 
7 Cassiopmee merely a dark band in the red. The spedtrum 
ol p Eyrae was about this time continuous without lines or 
bands. On September 5th, however, the dark lines H 
-O/i, and H r were observed. 
The two stars in question seemed, according to these 
phenomena, to belong to the class of temporary stars which 
blaze up with great intensity and then fade down to a greater 
or lesser extent. But further observations did not support 
this supposition. On August 13th, 1883, Herr von Gothard 
saw in the spectrum of y Cassiopeiae the red line H a flashing 
up along with the dark lines formerly observed ; but on ac^ 
count of the bad state of the atmosphere and of moonlight 
nothing could be determined with certainty. But on August 
2°th not only the line H a , but the lines H^ and D 3 were 
distinctly lecogmsed : the bright lines could even be mea- 
sured, and gave the wave-lengths for H a 6547, for D, 5867 
and foi 4^4 9 > whilst for the middle ol the dark band A 
was found = 633m. These lines were observed also August 
22nd, 24th, 25th, and 26th. H 0 and H /4 came out well D 
not so well and less frequently. On August 26th Herr Von 
Konkolly, who took part in the observations, succeeded in 
recognising the violet line H 7 . 
