H. Draper— Oxygen in the Sun. 267 
me to get original negatives on a scale about half the size of 
Angstrém’s charts in the Spectre Normal du Soleil. 
m with iron in the 
e to the original 
from which it was produced and, in order to study the matter 
faithfully, the negetihe must be examined carefully with a 
Magnifier. Beside this, ones ae to the fact that the solar 
