138 
One pikul of the dried patchouli, just as it is cut, yields from 24 to 
30 ounces of essential oil, and a sample free from the heavier stalks 
ies about double that amount. 
r. Hardouin says, that by an ordinary still not more than one-half 
of dus oil can be extracted, - temperature I presume not being high 
enough to pene the whole 
He also says that tbe green uo yield little or no oil, and ther 
fore it is necessary that they be dried before being subjected to né 
process of distillation. 
The oil is of two distinet varieties, the one being sage green, and tlie 
other the colonr of medium coloured sherry. 
Mr. Hardouin informed me that the green oil is produced from young 
leaves, and the golden-brown from old leaves, but I am inclined to think 
that there is a little doubt about this, and that soil - ccm have more 
to do with the colour of the oil than ‘the age of the lea 
Sometimes the one colour is in greater did diii the other?but 
the priees are the same for both. At present the price in Penang is 
from the distiller, and ‘find they are limpid and quite fluid at ordinary 
temperatures, but at 4° F. they Me rather thicker, but remain bright 
and clear. 
The golden-brown oil has a specific gravity of -9580 at 85° F., and 
the green oil a specific gravity of '9578 at the same temperature 
ctrum exhibited by the golden-brown oil i is not crossed by any 
The limits of this spectrum in wave lengths are 7140 to 4165 the 
oil being contained ina tube '6 inch i Ss diameter, both daylight and 
lamplight being used with the same resu 
The green oil gives a spectrum of fall intensity from the c line to 
midw. way is tween the b and F. lines, from which point it shades off 
gradually and disappears Ng little before the A line is reached. At the 
d end it extends beyond the c line, but with reduced intensity as far 
as to between the A and «lines. In wave lengths the limits of this 
spectrum are 7390 to 4130 in daylight. Lamplight Ms a greater 
if kept in a tight stoppered or corked bottle. "The scent of this old oil, 
however, was little inferior to fresb, though not quite so powerful. 
This bears out the statement 1 n Ure's Dictionary y of Arts, that “ the 
** essential oil of patchouli is bis of the least volatile of sd known, 
* hence it is one of the most persistent of perfumes from pla 
In the same work it is stated that if the plant P distilled, ater it has 
been gathered several years, more than haif the product will assume a 
chemically r^ resemble c cse in com When the s fluid 
—ÀÓ oil of patchouli te submitted to peso, distillation, there 
comes at the highest temperature a peculiar blue body, termed by 
