THE STEREOISOMERIC FORMS OF MENTHONE. 175 
In concluding this preliminary paper it is convenient to 
summarise the various stereoisomeric forms of menthone 
which appear on theoretical grounds to be capable of 
existing :— 
iE: a Wholly uncompensated compounds: d- and l-iso- 
2. Ll menthones, respectively. 
oD L Partially interually compensated compounds: d- 
4, Ld and l-menthones, respectively. 
5. Dd,Dl Partially racemic compounds: 1-racemic iso- 
6. Ld,Ll menthones. 
Te Dd,Ld ) Partially racemic compounds: 4-racemic iso- 
8. DI,Ll ) menthones. 
9. Dd,Ll ) Wholly racemic compounds: i-isomenthone 
10. Ld,Di ? and i-menthone, respectively. 
We are continuing the detailed investigation of the 
whole field of work indicated in this paper. 
