133 



by cold saponification, three hours contact. The rotation ^d = + I9"5°; the 

 specific gravity at tf° C. = -9524; the refractive index at 24° C. = 1-4828. 



It is thus evident that the whole of the ester is not easily redistilled by 

 steam, although the greater portion comes over in the more readily obtained 

 distillate. 



No. 2. — This material was collected at Boppy Mountain, in the Cobar 

 district, 440 miles west of Sydney, New South \\"ales, 25th May, 1903. The 

 terminal branchlets with fruit were steam distilled in the usual way. The amount 

 of oil obtained from 472 lb. of material was 46J oz., equal to o-6i6 per cent. The 

 rotation of the crude oil a^ = +31-3° ; specific gravity at \j° C. =0-8665; 

 refractive index at 19° C. =1-4779; saponification number = 34-19, equal to 

 ii-g66 per cent, ester. Saponification in the cold, twenty hours contact, gave 

 S.N. 22-07, equal to 7-725 per cent, ester. When freshly distilled, the oil was 

 insoluble in ten volumes 80 per cent, alcohol, but was soluble in one volume go 

 per cent. It, however, on keeping, soon became insoluble in ten volumes 90 

 per cent, alcohol. 



On redistilling, onl}^ a few drops came over below 156° C. Between 156° 

 and 161° C. 30 per cent, distilled; between 161° and 165° C. 22 per cent. ; between 

 165° and 200° C. 37 per cent. ; between 200° and 228° C. 6 per cent. The specific 

 gravity of the first fraction at jf° C. =0-8545; of the second, 0-8555; of the 

 third, 0-8649; °t" the fourth, 0-9434. 



The rotation of the first fraction a^ = + 32-6°; of the second, + 32-0°; 

 of the third, 4- 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 per cent, came over between 155° and 157° C. The specific gravity of this at 

 15° C. was o-86o6 ; the rotation rf^ =+ 34'5°; or a specific rotation [rtjo = + 

 40-09°; the refractive index at 20° C. = 1-4731. The nitrosochloride was also 

 prepared from it, and this when purified melted at 107-8° C. These results show 

 this terpene to be dextro-rotatory pinene, as in the previous sample. 



To determine the limonene and dipentene, the second and third fractions 

 were again distilled, and 16 per cent, which came over between 172° and 175° C. 

 (uncor.) was obtained. This had specific gravity at 15° C. = 0-8535 and rotation 

 Ad = + 28-6°. The tetrabromide was readily prepared from it in some quantity, 

 and on complete purification from acetic ether it melted at 116° C. It was 

 recrystallised, but still gave the same result. This indicated that both dextro- 

 rotatory limonene and dipentene were present. This high melting point of the 

 tetrabromide was met with in all the samples of Callitris from which it has been 

 prepared. 



That both dextro-rotatory limonene and dipentene were present was shown 

 also bv the activitv of the tetrabromide when dissolved in acetic ether : this was 



