. SCIENTIFIC NOTES ON ESSENTIAL OILS. 27 
state as well as in tGe form of cenanthylic, caprylic and pelargonic esters. The con- 
stants of the myrcenol of hop oil agree well with those of the synthetic product. 
The quantitative composition of hop oil may be approximately as follows: 30 to 50 p.c. 
of myrcene; 15 to 20 p.c. humulene, and 20 to 40 p.c. of myrcenol esters. 
Illustrating his paper with numerous tables and graphic plates, Rabak arrives at the 
following summary on the 
Properties of hop oils of different origin: 
Yield solubility 
Origin Year p.c. 290° Np200 acid v. ester v. in 94 p.c. alcohol 
California’). . 1907 0,24 0823 1,4856 23 44,4 5,4 Vol. 
(408° SOSe 7 08eo. 14eeS = 17°. 455. 4°", 
0 ae 080. 1 4se 1S. 468 36 
ere. 4007 0,20 ; 08343 - 1.4802... 1,6 57,0. 4,6, 
Hopes -aheas + 1.4720 ~.,' 1,0: .50,2.1.3,3~ , 
$909. ~ 030) 69°0-9483) 1.42052 2A 560-3, 
NewYork. . . 1907 0,16 0,862 1,484 36 610 35 , 
ioe ia, OST 1.4750. 2.1. 47,0 35S 
ise 00s Oee7,. 14800, 25 51.8 37 ".,, 
Washington. . 1908 0,36 0,850 1,4763 10 518 35 , 
ae Os toe ak 1S 538 330 
Saaz(Bohemia) 1907 0,32 0,855 1,4905 1,5 52,8 es ee os 
1908 0,23 0,824 1,4852 1,0 52,8 Oni, 
1909 0,24 0,861 1,4829 3.06 a3 Ae 
The oils of different origin contain the same component parts in varying propor- 
tions. The most valuable part is the ester to which, according to Rabak, the oil owes 
its aroma in avery large measure. American hop varieties do not seem to excel as 
regards fine odour. 
Oil of Lantana Camara. D. D. Kanga’) reports on the oil from Lantana 
Camara, L.*), a shrub-like verbenacea originating from tropical America, and growing 
wild in enormous quantities in British India. This plant has become a veritable pest 
in the southern parts of India. In the districts round Bombay it is called “Ghaneri”, 
the people also calling it “Heliotrope of the lower land”. The properties of the oil 
obtained from dried and fresh flowers are as follows: — 
Oil from: dried and from fresh flowers from leaves 
CAM Se oa oat o yellow yellow yellow 
Et re Le ae savin-like same same 
MMC ce ok ORE: 0,07-p:¢. — 0; ipxe: 
Sa ee ere d= 0,915 — d= 0,9211 
Berna ages Ai + 23,9° = + 1,96° 
DASE Sa ee, ee 1,4987 1,5031 Npzz0 1,48933 ~ 
on Pe ee mere eae 10 rare =, 
Sap.v. after acetylation 43,6 ret oe 
1) Average figure for 5 oils from five different Californian localities. — °) Arch. der Pharm. 252 
(1914), 1. — #%) Comp. Report October 1909, 73; October 1918, 67. 
