AND THEIR ESSENTIAL OILS. 11)9 



cellis vix ullis. Calyx turbinatis, operculum 

 hemisphericum v. conicum. 



Fructus turbinatus, margo contracto, con- 

 cave V longa, ^" lata, valvae prorsus inclusae. 



Chemistry, 



Kfiseiitial Oil. — The material of this form for distillation 

 was collected at St. Marys in June, 1912. The average 

 yield of oil was 0657. The crude oil was little coloured, 

 of a terpene odour, and contained much phellandrene, 

 scarcely any pinene, and a very small amount of eucalyp- 

 tol. Eudesmol was detected in it. The oil belongs to 

 the " Peppermint " group, as it contained a small amount 

 of piperitone, and a considerable quantity of high boiling 

 constituents was also present. The yield of oil was small, 

 and for this and other reasons can have little commercial 

 value. The principal constituent in the high boiling frac- 

 tion appeared to be the sesquiterpene. 



The specific gravity of the crude oil at 15^ C. = 0'8864 ; 

 rotation an = -27-60; refractive index at 17o = 14872, 

 and was soluble in 5 volumes 80 per cent, alcohol. The 

 ^aponification number for the esters and free acid was only 

 3-2. 



On rectification, a few drops of acid water, and a little 

 volatile aldehydes of a not unpleasant odour, came over 

 iDelow 1730C. (corr.). Between 172-1980 G8 per cent, 

 distilled; between 198-265'^ only 1 c.c. came over; and 

 between 265-282° 26 per cent, distilled. These fractions 

 gave the following results: — 



Sp. Gr at „ . ,. Hef. Index 



, -n /. Rotation M * i-o 



lo° C. I). at 1 /". 



First fraction 0-859-i ... —45-1^ ... 1-4808 



Second fraction 0-9-108 ... Dp.xtro-rottttoi y ... 1-5029 



(265-282°) 8 to 10°. hut 



light did not 

 pa-s well 



The eucaiyptol was determined by the resorcinol method 

 in the portion distilling below 198*^, and gave a result 

 equal to 7 per cent, of that constituent in the crude oil. 



These results indicate that this form is somewliat closely 

 associat?d witli the Tasmanian E. rirfjata. The oil from 

 the latter, however, contained more eucaiyptol and more 

 eudes.nol, while that of h\ tneiiinin had morp phellandrene, 

 as indicated by the rotation figures. 



