272 3IR. GEORGE KNOTT OX THE 



solely ft'om my own observations, Avithout reference to any 

 of earlier date. 



Treating the six observed minima in the same manner, 

 we obtain the following elements, tbe period presenting a 

 striking accordance with that deduced from the observed 



maxima — 



Period = 1 3 7 • 5 5 days, 

 Epoch = 1864, June ly'so, 



the differences between the calculated and observed times 



of minima being — 



Calc — Obs. 

 days. 



+ 2'3S 



— i'6o 



— 20O* 

 -1-95 



-2-15 



+ 5-40 



An examination of the mean light-curve (a copy of 



which accompanies this communication), which was laid 



down from the coordinates resulting from a discussion of 



all the observations I have obtained, yields the following 



results : — 



Mean magnitude at maximum 777 



Mean magnitude at minimum lyi^- 



Mean range of variation 5-37 magnitudes 



Mean magnitude io"32 



Interral from minimum to maximum 66'o days 



Interval from maximum to minimum 71 "6 days 



Interval from min. to mean mag 25-8 days 



Interval from mean mag. to max 40*2 days 



Interval from max. to mean mag 37*3 days 



Interval from mean mag. to min 34-3 days 



Interval from mean mag. before to mean mag. 



after maximum 77-5 days 



Interval from mean mag. before to mean 



mag. after minimum 59-1 days 



An examination of the various results of observation and 

 calculation given in the former part of this paper suggests 

 the following general remarks : — Like many other variable 

 stars, R Vulpeculse increases more rapidly than it decreases. 



