Sir. <br/><br/>
The study of indicators and the law of mass action. 

 - London :  John Murray,  [192-] 
 - Modern science memoirs ;  no. 1 .
<br/><br/> Reprinted from The School Science Review ...  School science review reprints, no. 1. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Indicators and test-papers.<br/>Atomic mass.