The Piscian Stars. 



135 



The variations from one species to another are shown in the accom- 

 panying map (p. 136), which also indicates the connection with stars 

 of the group which precedes,it, and suggests a later Species 8, not yet 

 identified by observation. 



Owing to the difficulties attending the observations, the actual 

 appearances of the secondary bands are not quite so regular as is 

 shown in the map. 



The Colours of the Piscian Stars. 



The classification arrived at was next tested by reference to the 

 colour phenomena. Dun^r employs two methods of indicating the 

 colours of the stars, which he has specially observed— first, by means of 

 initial letters, arid second, by means of numbers, such that 10 = blood 

 red. Thus : 



Kj = rouge jaune. 

 Erj = rouge jaune fonce. 

 Errj = presque rouge absolae. 



The numbers show a fair agreement with the letters employed, if 

 we omit one Erj star, which is given the number 9 '3. The following 

 table compares the colour numbers corresponding to the initial 

 letters : — 



Initial letters. 



Eange of numbers 

 corresponding. 



Mean No. 



Eenaarks. 



Erj 

 Errj 



7- 8— 8-6 



8- 8—9 -5 



8-2 

 8-3 

 9 04 



One member onlv. 

 One star, 9"3, omitted. 



If we consider the colour numbers corresponding to the various 

 species into which I have divided the group, we find the average 

 numbers to be as follows :- — 



Species 1 8-1 



2 8-6 



3 8-2 



4 8-1 



5 8-2 



6 8-8 



7 8-6 



On the whole, therefore, considering the difficulty of the observa- 

 tions, there is an increase of redness as we pass successively through 



