130 



INORGANIC EVOLUTION. 



[CHAP. 



We saw in the case of the ordinary stars that a very rapid pro- 

 gression in number is to be noticed from the pole of the Milky Way 

 to the plane ; we had three stars at the pole when we had fifty-three in 

 the plane. 



Duner found, with regard to his carbon stars, that there was dis- 

 tinctly an increase from the pole towards the plane, but we observe 

 that the rate of increase is very much less in this case ; so that, 

 starting with three at the pole, he only found twenty-nine in the plane. 

 Although then it was true that the number of stars did increase 

 towards the Milky Way, they did not increase so rapidly as the stars 

 taken as a whole ; still, from his observations, we are justified in 

 stating that there is an increase as we approach the plane of the Milky 

 Way. They are, therefore, not limited to the plane. 



POLE90 



LKT 



!. to so vo 5b 60 >a- 



Fia. 38. Comparison of relative numbers of stars generally and carbon stars. 



That I was in 1884. In 1891 Professor Pickering, when he found 

 that he had collected something like 10,000 stars in the Draper cata- 

 logue, began to consider their distribution in different parts of space 

 in relation to the then classification, which was practically one founded 

 on hieroglyphics, since we knew very little about the chemistry of the 

 different bodies at that time. 



