XVI.] THE DISTRIBUTION OF CHEMICAL GROUPS OF STARS. 133 



American astronomer, also interested himself in this question of the 

 bright-line stars, and he discussed them, his catalogue containing fifty- 

 five as opposed to Pickering's thirty-three. He found also that they were 



collected almost exclusively in the Milky Way, and that outside the 

 Milky Way . practically none had ever been observed. The importance 

 of this result I will indicate by and by. The . central line of the map 



