ON THE PINES OF AUSTRALIA. 163 
pared; this melted at 118° C. By fractional crystallisation 
of this from acetic ether, three separate sets of crystals 
were obtained, which melted respectively at 122° C., at 
118—119° C., and 117° C. As dipentene tetrabromide is 
less soluble than that of limonene, this shows that both 
forms were present. That both dextrolimonene and 
dipentene were present was also shown by the activity of 
the tetrabromide when dissolved in acetic ether; this was 
strongly dextrorotatory. 
The fourth fraction was saponified, and from the separated 
oil pure borneol was prepared. The acids of the esters 
were not determined, as this had been done in the previous 
sample. 
* * * 
No. 3.—This material was collected at Trangie, 320 miles 
west of Sydney, New South Wales, 28th November, 1902. 
The leaves were very dry at this time, as the State was 
suffering from a serious drought. This dryness does not, 
however, seem to interfere either with the yield of oil or 
with its constituents. 472 ibs. of material gave 46 ounces 
oil = 0°617%. The rotation a» of the crude oil was + 30°8°; 
specific gravity at i# C. = 0°8631; refractive index = 
1°4755 at 20° C.; saponification number 36°46 equal to 12°76% 
ester. The freshly distilled oil was soluble in two volumes 
907° alcohol. A portion of the oil was esterised by boiling 
with acetic anhydride and sodium acetate in the usual way. 
The saponification number was then 52°09, equal to 18°23% 
ester. The free alcohol present was therefore 4°84 as 
borneol. On redistilling, 277 came over below 160° C.; 37% 
between 160 and 165° C.; 167+ 160—180° C.; and 12% 180— 
225° OC. 
The specific gravity at 24° C. first fraction = 0°8477; of 
the second 0°8494; of the third 0°8561; of the fourth 0°9256. 
The rotation dp of the first fraction = + 32°4°; of the second 
+ 31°6°; of the third + 30°5°; of the fourth + 34°2°. The 
