170 SPECIAL RESULTS IN THE TJRANOLOGICAL PORTION 



11. Scuti E., A. E. 279 52', Bed. 5 5V. Sometimes 

 the fluctuations of the light of this star are comprised 

 within a few gradations, whilst at other times it sinks from 

 the 5th to the 9th magnitude. It has been still too little 

 observed to permit us to decide whether any determinate 

 rule prevails in these alterations. The length of the 

 period is also subject to considerable fluctuations. 



12. Virginis E., E. A. 187 43', Ded. + 7 49'. Its 

 period and maximum brightness are tolerably regular, yet 

 deviations occur which appear to me too large to be as- 

 cribed solely to errors of observation. 



13. Aquarii E, E. A. 354 11', Decl.-16 6'. 



14. Serpentis E, E. A. 235 57'] Ded. + l5 36'. 



15. Serpentis S, E. A. 228 40', Decl.-f 14 52'. 



16. Cancri E, E. A. 122 6', Bed. + 12 9'. 

 Eespecting these four stars, observations of which are 



exceedingly scanty, there is little more to be said than is 

 given in the table. 



17. a Cassiopeia, E. A. 8 0', Decl. + 55 43'. This 

 star is very difficult to observe ; the difference between 

 maximum and minimum only amounts to a few gradations, 

 and is moreover as variable as is the length of the period. 

 The very different results assigned for it are attributable 

 to this circumstance. The result which I have given re- 

 presents sufficiently well the observations from 1782 to 

 1849, and appears to me the most probable. 



18. a Orionis, E. A. 86 46', Decl. + 7 22'. The 

 variation in the light of this star from the minimum to the 

 maximum only amounts to four gradations ; it increases 

 in brightness during 91 J days, and decreases during 104: 

 its decrease from the 20th to the 70th day after the maxi- 



