GREY GUM AND ITS ESSENTIAL OIL. 269 
branchlets gave 114 ounces of oil ; rn gravity as obtained 
9122 @ 15° C.; specific rotation [a], — 2°52. 
On redistillation of 100 cc., a few drops only to 165-2° C., but 
more than usual to 170-4° C. [See table.] 
First fraction, specific gravity -9034 ; — rotation — 3-04. 
Secon SY. Vilas “ ‘5 - 1:92. 
maa in the eradé oil = 46-4 ts cent. 
» second fraction =53°8 per cent. 
These aoa were from a very fine tree, they were divided into 
two parts. The oil from the other part had the same specific 
gravity, specific rotation, and contained the same amount of 
eucalyptol in the crude oil. 
10. Oil obtained by mixing equal volumes of each of the nine oils 
investigated of Eucalyptus punctata, DC. This was done, 
the better to compare the oil from this tree with that of a 
commercial sample of the “blue gum,” Hucalyptus globulus, 
received from the Tasmanian Eucalyptus Oil Co. Specific 
gravity at 16°C.=-9153. Specific rotation [a], + ‘927. 
har redistillation of 100 ce. a few drops came over below 
73 It commenced to distil at that temperature, and 
slowly rose to 170:4° C. [See table. | 
This oil is but little coloured, brownish yellow in tint. 
First fraction, specific = ‘910 ; specific rotation + 2°36. 
Secon - 56 ; » 1*2. 
Bamlgptol in the ‘chide oil = 55:11 per cent. 
‘i second fraction = 62°6 per cent. 
This oil hod not contain phellandrene, but with the nitrite test 
the oil becomes an emerald green colour, It differs in this respect 
from the oil of Z. globulus. 
11. Oil obtained from the “blue gum,” Hucalyptus globulus, 
Platypus brand. 
Oil light in colour, yellowish ‘in tint; oe gravity, as 
received, ‘9185 @ 16° C.; specific rotation Ce 8. 
On redistillation of 100 ce. a few drops only came over below 
167-3° ©. These contained some aldehydes; this portion was — 
removed, and the oil then commenced to distil rapidly, fifteen per 
cent. being obtained below 170°4°C. [See table. ] 
