— 95 — 
Judging from the results hitherto obtained, there would be only a 
small group of sesquiterpenes in which the individual isoprene mole- 
cules might be grouped as follows: 
CH3 CH2 
C 
C H3 C H2 
c 
CH 
CH 
CH2 
C H2 C H2 
CH2 CH 
C CH, 
CH CH 
\/\ 
C CH. 
CH3 CH 
C 
CH3 CH2 
3 isoprene 
CH2 C -^2 
c 
CH3 CH3 
sesquiterpene 
The sesquiterpenes with a remarkably small specific gravity may 
possibly be either completely olefinic compounds, or terpenes, in which 
the second ring is not yet closed. The structure of the latter might 
be conceived somewhat in the following manner: 
CH, CH2 C.CH3 
CH C CR 
CH CR 
C H2 C H2 
CH ca 
c 
CH3 
sesquiterpene with three double linkings. 
These views harmonise with those held bv Schreiner. 
