350 Jd. ES VOGR 
eutectic. This term strikes the essential point, since the eutectic 
in question consists practically only of Qu, Or, and Ab. To this 
must, however, be added a quite small admixture of An, iron 
oxide, and ferromagnesian silicate, so that the eutectic in reality is 
more complicated. In order to avoid misunderstanding I have 
therefore put the term ‘“‘ternary”’ in quotation marks. 
[To be continued] 
