GREY GUM AND ITS ESSENTIAL OIL. 265 
We have quoted the above remarks to give an idea of the exact 
position of the industry, and to show that it is futile to continue 
distilling oils, that by their want of eucalyptol, are of little 
value, 
(b) Chemical investigations.—We submit herewith the results 
of the investigations of the oil of ten distillations from the leaves 
of the various trees of EH. pwnctata, and under varying conditions, 
We have taken the leaves of the largest trees in the district 
obtainable, and we have divided the leaves taken from one tree 
into two equal parts, and thus obtained two distillations from the 
leaves of one tree. We have taken the leaves from young trees 
from twenty to thirty feet in height, and in fact under almost all 
imaginable conditions. We have also distilled the oil from the 
leaves taken from “suckers,” called by us “ young leaves.” 
1. Oil from leaves collected near Canterbury, Sydney, 6th May, 
1897. Distilled 7th May. 
Oil light in colour; odour pleasant; yield 1:19 per cent., or 
100 Ibs. of leaves with branchlets gave 19 ounces of oil; specific 
gravity as obtained -9192 @ 17°C.; specific rotation [a], + 2°19. 
On redistillation of 100 cc. a few drops only were obtained 
below 164:2°C. This portion contained aldehydes, the thermo- 
meter then slowly rose to 170°4°C., when the distillation proceeded 
steadily. The temperatures were read to whole degrees, and 
have been corrected to the nearest decimal. [See table.] 
First fraction, specific gravity =.9127; specific rotation + 3°61. 
Second ” ” = +9187 ” ? +1°9. 
Eucalyptol in ths ere oil =60.8 per cent. 
” » second fraction=78'5 _,, 
This is an excellent oil, and was from a fair — tree, all 
leaves being also from one tree. 
a TS ne 
1 We were anxious to distil young leaves from this tree, and avery 
was taken to obtain them from the remains of undoubted “grey gums,” 
judging from the bark, ete. 
