﻿Indiana University Studies 



March, 1912 



BLOOMINGTON, INDIANA 



Nos. 12 TO 14 



Prefatory Note 



The first of the articles in this issue of the University Studies 

 (No. 12) is a continuation of the studies on perchloric acid, to which 

 three articles were devoted in the issue dated July, 1910. The 

 second article (No. 13) is a collateral study to the preceding. The 

 third article (No. 14) is a condensation of a thesis for the degree 

 Doctor of Philosophy, for which the observations were made in the 

 Kirkwood Observatory of "Mcli ana University. 



