— 72 — 
Oil of Chamomile, Roman (Chamomillae essentia). Blue^); 
d^go = 0,905 to 0,915; soluble in 8 to 10 parts alcohol 2). 
^) In the course of time, under the influence of the air and light, the blue 
colour changes into green to brownish yellow. 
^) The oil already dissolves in i to 2 vol. 80 per cent, alcohol. 
It is further recommended to determine the saponification number; 250 to 300. 
Oil of Cinnamon [Cinnamomi esse7itid)^\ The distillate from 
the bark of Cassia lignea, or Cinnamomum Ceylanicum\ d-^go = 1,050 
to 1,070; soluble in three parts 70 per cent, alcohol; soluble in every 
proportion in strong alcohol; the mixture of equal parts cinnamon oil 
and fuming nitric acid, when cooled to a temperature below 5°, con- 
denses into a crystalline white mass^); when evaporated on the water 
bath, the oil should leave not more than 8 "per cent, residue; the 
alcoholic solution of the oil (0,2 : 10,0) should become brown (not 
blue or green) on addition of a drop of ferric chloride solution; 
aldehyde-content: at least 70 per cent. 
^) It does not appear from the above which cinnamon oil is really meant. The 
oil from the bark of Cassia lig7iea is not, as a matter of fact, a commercial article, 
as it is not produced on a large scale. The oil produced from the bark of Cinna- 
momum Ceylanicum^ on the other hand, has a quite different specific gravity (1,023 
to 1,040), than the one required, which belongs simply to cassia oil, obtained from 
the leaves and branches of Ci7inamomum Cassia. The specified solubility and residue 
on evaporation again refer to Ceylon cinnamon oil. It would be desirable to correct 
the requirements which are in direct contradiction to each other. 
^) This test gives no information on the purity of the oil. See Gildemeister 
and Hoffmann, "The Volatile Oils". 
Eucalyptol. d^go = 0,931): aj) = ± 0°; boiling point 176° to 
177°; almost insoluble in water, readily soluble in alcohol, ether and 
chloroform; makes a clear solution with an equal vol. Paraffinum 
liquidum; if some bromine vapour is introduced in a test tube of 
which the inside has been moistened with a few drops eucalyptol, 
fine red crystals should be formed; in a freezing mixture, at 1°, 
eucalyptol should solidify into long colourless needles 2); on the water 
bath it should evaporate without weighable residue. 
^) The specific gravity of pure eucalyptol lies between 0,928 and 0,930. 
^) The solidifying or melting point of eucalyptol does not lie at -f- i°, but at 
— I**; the solidification has sometimes to be brought about by the introduction of 
a small crystal of solid eucalyptol. 
Eugenol. Colourless or yellowish, becomes brown on exposure 
to the air. d^so = 1,072 to 1,074; boiling point 251° to 252°^); 
sparingly soluble in water, readily in alcohol, ether, and glacial acetic 
acid. I gram eugenol makes a clear solution with 2 cc. caustic soda lye 
(digo = 1,33) and 28 cc. water, which gradually becomes cloudy when 
air is admitted. When shaking 5 drops eugenol with 10 cc. lime-water 
