NEW PHARMACOPOEIAS. 47 
African copaiba (when distilled in a vacuum, the first 10 p.c. of the distillate has an 
optical rotation lower than that of the original oil)'). 
1) This test serves in the first place for testing for gurjun balsam oil. Its reliability has, by the way, 
been questioned by Parry. Chemist and Druggist 80 (1912), 19. 
Oil of Coriander (Olewm Coriandri). Colourless or pale yellow; di1s.50 0.870 to 0.885; 
éy +8 to +. 14°; npsso 1.463 to 1.467; soluble in 3 parts of 70 p.c. alcohol. 
Oil of Cubebs (Olewm Cubebae). Colourless, pale green or greenish-yellow; di5.500.910 
to 0.930; &) — 25 to — 40°; np»x0o 1.486 to 1.500; not less than 60 p.c. distils between 
250 and 280°. 
Oil of Dill (Olewn Anethi). Colourless or pale yellow, darkening on keeping; 
dis.s0 0.900 to 0.915; #) +70 to + 80°; Np»s0 1.483 to 1.488; soluble in 3 parts of 
90 p.c. alcohol. 
Oil of Eucalyptus (Olewm Eucalypti). Colourless or pale yellow; dis.50 0.910 to 
0.930; a), —10 to + 10°; soluble in 5 parts of 70 p.c. alcohol; contains not less than 
55 p.c. of cineol (phosphoric acid method)'); test for phellandrene; oils containing 
much phellandrene are excluded. 
1) Compare with what we said on the subject when discussing cajuput oil. 
Oil of Siberian Fir (Olewm Abietis). Colourless or nearly so; dis.50 0.900 to 0.920 *)s 
&@y — 32 to — 42°7); np»s0 about 1.474; contains from 30 to 40p.c. of esters, calculated 
as bornyl acetate. 
1) The higher limit of value is too low, the specific gravity goes up to 0.925. 
2) The rotation of Siberian fir oil varies between — 37 and — 43°. 
Oil of Juniper (Olewm Juniperi). Colourless or pale yellowish-green; dj5.50 0.862 
to 0.890"), increasing with age; ~—3 to — 15° np. 1.472 to 1.488; when freshly 
distilled it is soluble in 4 parts of a mixture of equal volumes of 90 p.c. and absolute 
alcohol, the solubility decreasing with age. 
1) 0.860 would have been more correct as the lower limit of value, so as to do justice to the Hungarian 
oil which has been taken into consideration in the limits for the rotation. 
Oil of Juniper, empyreumatic see Oil of Cade. 
Oil of Lavender (Olewm Lavandulae). Pale yellow or yellowish-green; dis.50 0.883 
to 0.900; «)—3 to —10°; soluble in 4 parts of 70 p.c. alcohol; contains from 7 to 
11 p.c. of esters (English oil), or not less than 30 p.c. of esters (foreign oil), calculated 
as linalyl acetate’). 
1) From these requirements it becomes evident that French as well as English distillates are now official. 
Oil of Lemon (Olewm Limonis). Pale yellow; dis.s0 0.857 to 0.8601); a) +587) to 
+ 64°; mp0 1.473 to 1.476; citral content not less than 4 p.c. (determined with 
hydroxylamine)?*). 
1) 0.861 would be more correct as the higher limit of value. 
2) Lower rotations occur repeatedly (down to 57°), in fact there were years when the bulk of arrivals 
rotated between + 54 and + 56°. Comp. Report October 1918, 52. 
3) In our Report October 1909, 154, where we discussed the hydroxylamine method, we pointed out, 
that the values obtained thereby are about 10p.c. too low, calculated on+the citral present in the oil. We 
would like once again to lay stress on this fact, as in cases where the actual citral content of the oil borders 
on the lowest limit, results will be found with hydroxylamine which must lead to a rejection of the oil, 
whereas such a verdict would really be due to the incorrectness of the method. Moreover, it should not be 
forgotten that even with otherwise good oils a somewhat lower citral content may occur every now and then; 
the test should not, therefore, be applied too rigourously (comp. Report April 1914, 59). It may here be called 
to mind that the above-mentioned B. P. requirement has given rise to a controversy as to citral content of 
