1889.] Variability in condensing Swarms of Meteorites, 411 



No. (Duner). Colour (Chandler). 



125 2-0 

 159 2-7 

 187 2-0 

 222 3-6 

 100 1-6 

 293 43 

 29 2-0 



Mean 2 '4. 



Duner's colour = Jjr. 



None common to Duner and Chandler. 



Mean colour, say, 0*7. 



It will be seen that the increments for one colour stage of Duner are 

 1*6, 1*7, and 1*8 respectively, or a mean of 1*7. Since there are none 

 of Duner's Jjr stars in Chandler's list, we may use this increment to 

 approximate to the colour; this gives us the number 7. We thus 

 get : — 



Duner's colour. Chandler's number. 



Brrj 7*5 



Rrj 5-9 



Rj 4-2 



Jr 2-4 



Jjr 0-7 

 Using these mean numbers, we may determine the mean colour- 

 number associated with each of the fifteen species into which 

 Group II has been divided. The following tables show the results 

 obtained. 



DuneVs No. 



Colour. 



2. 56 



4-2 



93 



4-2 



220 



2-4 



223 



2-4 



246 



2-4 





Mean 3'1. 



3. 42 



2-4 



53 



2-4 



70 



2-4 



185 



2-4 



198 



2-4 



228 



4-2 



276 



0-6 



290 



2-4 





Mean 2"4. 



