162 R. T. BAKER AND H. G. SMITH. 
ester. Saponification in the cold, 20 hours contact, gave 
S.N. 22°07 equal to 7°725% ester. When freshly distilled it 
was insoluble in ten volumes 80% alcohol, but was soluble 
in one volume 907. It, however, on keeping, soon became 
insoluble in ten volumes 90% alcohol. 
On redistilling only a few drops came over below 156° O. 
Between 156 and 161° O. 30% distilled; between 161 and 
165° O. 22%; between 165 and 200° O. 377; between 200 and 
228° O. 6). The specific gravity of the first fraction at 
1£° OG, = 0°8545; of the second 0°8555; of the third 0°8649; 
of the fourth 0°9434. 
The rotation dp of the first fraction = + 32°6°; of the 
second + 32°0°; of the third + 30°7°; of the fourth + 33°5°. 
Another distillation was made with comparable results. 
The oil which came over below 161° C. was redistilled, and 
66% came over between 155 and 157° ©. The specific 
gravity of thisat 15° O. was 0°8606; the rotation ay + 34°53’; 
or a specific rotation [a]p = + 40°09"; the refractive index 
at 20° OC. = 14731. The nitrosochloride was also prepared 
from it. These results show this terpene to be dextro- 
rotatory pinene as in the previous sample. 
To determine the limonene and depentene, the second 
and third fractions were again distilled, and 16% which 
came over between 172 and 175° C. (uncor.) was obtained. 
This had specific gravity at 15° C. = 0°8535 and rotation 
yp = + 28°6°. The tetrabromide was readily prepared from 
it in some quantity. On complete purification this 
melted at 116°C. It was recrystallised, but still the same 
result. This indicated that both dextrorotatory limonene 
and dipentene were present. This high melting point of 
the tetrabromide has been met with in all the samples of 
Callitris from which it has been prepared. From the oil 
of one species of Callitris, which consisted very largely of 
dextro-limonene and dipentene, the tetrabromide was pre- 
