the apparatus and a detailed description are given in the original and in the Chem, 
Sonn of ater al essential oil in some LUG: 
cloves aniseed — “mace” | . 
fae per cent. per cent.- per cent. 
content of -watef <. 0)! 7. cas 5 B00) Oe es 
content of essential oil 2 2 222. eae i 
total loss on drying at 50°. . . 11.6 68 123.530 ee 
loss of essential oil . . . . . . 6.99 ~ 6.7 — 9.8 
- total loss on drying at 50° followed | Ree 
up by drying at 103 to 105° | eee ae te ee . eet 
loss of essential oil . . . . 20:9 1.4 5.0.0 - == 
total loss on drying at 103 9 105° 29.5 11.2- 2 186. 4a ae 
loss of essential oil . . . . . . 209 1.4 79 Be eh 28 
total loss in the desiccator. . . . 7.9 67 ~~ 109°. 104° = 104755 
loss of essential oil . . . . 26 9 — 746. 
total loss in the evacuated desiccator _ 8.6 10.6 14.4 11.0. ee 
loss of eSsential soil 753-7. sg reed ae 5.8 ae 2 Se 
total loss in the lime Pace ee = 5.9 8.9 a 
loss. Of essential. Of ot Se a =a 3.4 Bay a 7a 
Physical Notes. ; A : | a 
The usual distilling apparatus of commerce are generally not adaptable to the 
distillation of essential oils in vacuo, especially if some considerable quantity of oil is 
to be fractionated. In such cases, a receiver described by M. T. Bogert’) and which, — 
although somewhat different in form, has been used in our laboratories for a good > 
many years already, will prove very useful. With the aid of this apparatus, any 
quantity of volatile oil may be fractionated without interrupting the process’). The — 
apparatus consists of a cylindrical receiving chamber, A, graduated in cc. and with a 
funnel stem through which the distillate collected in A may be removed at will by — 
Opening the plain cock F. On one side of this receiving chamber, near the top, is th 
opening B, for the end of the condenser. From the top of the receiving chamber A, ~ 
the tube C passes to the pump P and to the outer jacket E of the funnel stem. On. . 
this tube C, there is a plain cock at H, and a 3-way cock with offset ports. at D. By 
turning this 3-way cock 90°, connection is established, by means of a perforation 
the stem of the cock, between the air and, through the outer jacket E, the lower — 
receiving vessel. In this way the atmospheric pressure can be restored to the lower Ee 
vessel without in any way affecting the vacuum throughout the rest of the distill ; 
system. When the first fraction has been collected in A, and its volume read, it | 
be run into the lower receiving vessel simply by opening the stopcock F. Then | 
stopcocks F and H are closed, and the 3-way cock turned so as to close the connec af 
between the lower receiver and the pump and open ‘that to the outer air. 
ebbiatories which happen to be Se ae des with more than one pump. 
1) Journ. Ind. Eng. Chemistry 7 (1915), 785. The author kindly sent us a reprint. 
HM. 1273. 
