— 31 — 
which naturally should also be taken into consideration in valuing the 
oil of cloves. 
We would still point out that in numerous examinations made by 
us in recent times, we have observed that the use of a 5 per cent, 
soda- lye in the case of rich clove oils (about 95 per cent, eugenol) 
is unsuitable, as the liquor dissolves such oils readily, and this leads 
to an incorrect estimation of the oil in question. As this evil is ob- 
viated when a 3 per cent, soda liquor is used, we have lately 
employed such solution exclusively, and we have thereby rendered the 
method more useful for practical purposes than it was hitherto. 
Cognac Oil. The distillers on the Rhine and Moselle complain 
about lack of yeast from wine and endeavour to obtain higher prices 
for fine distillates. The latter are comparatively scarce, but oils with 
an empyreumatic, soapy odour are plentiful. Cognac oil can easily be 
produced at any price by adulteration with artificial oil, and it requires 
an expert knowledge to estimate it at its true value. The trade in 
this oil is a matter of confidence pure and simple. 
Coriander Oil. The prices had to be raised further, as coriander 
from all producing countries is quoted higher. The harvest in Russia 
is said to have had a very modest result; Thuringia also complains 
about the results of the harvests. From Moravia definite reports have 
not yet been received. From Hungary we received a first sample 
consignment; in that country it is intended to increase the cultivation 
considerably next year. This variety may possibly have to be taken 
into account later on. 
Cypress Oil. The excellent effect of this oil in whooping-cough 
has recently received much attention from various physicians. It is 
now proposed to try this oil for emphysematous patients, for whom 
at present oil of turpentine is frequently employed. It looks as if 
this remedy will at last find recognition. The indifference displayed 
towards it up to the present, seems inexplicable to those who have 
had opportunities of observing the grand results obtained with this oil. 
Erigeron Oil. The oil of Erechthitis hieracifolia — a plant known 
in North America under the name of ''Fireweed''\ — is rarely met with 
in commerce in the pure state, but is often substituted by the oil of 
Erigeron canadensis (Fleabane). Kebler and Pancoast^) have 
in the course of many years only twice met genuine fireweed oil; 
these oils had the following constants : No. i:d = o,84i2;aj) = -f-i°3i'; 
soluble in equal parts alcohol and more. No. 2: d = 0,8244; aj) = -|-2° 1 2^; 
insoluble in alcohol. 
^) Americ. Journ. of Pharm. 75 (1903), 216. 
