160 R. T. BAKER AND H. G. SMITH. 
geranyl-acetate, and from it the pure geraniol has been 
isolated and determined. Although geraniol has not been 
separated in a pure condition from the oil of C. glauca, as 
it was not thought necessary, yet, we think that the results 
justify us in considering it to be present. The fact of cold 
saponification, together with the odour, and also that there 
isa marked gradation in the constituents of the Callitris 
oils, increasing in the several species until a maximum is 
reached in one of them. 
Over 60% of geranyl-acetate has been found in the oil of 
one species of Callitris. Geranyl-acetate as wellas bornyl- 
acetate may thus be considered to be present in the leaf 
oil of C. glauca, as well as in that of most species of Calli- 
tris. 19 hours contact with alcoholic potash in the cold 
saponified less than two-thirds of the total ester in the oil 
of C. glauca, while readily saponifying the total ester in 
the oil of the other species referred tointhree hours. The 
data at present available are not sufficient to enable the 
method of cold saponification to be considered of actual 
quantitative value, but of its indicative value there can be 
little doubt. 
Volatile Acids.—The aqueous solution separated from 
the saponified alcohols was evaporated down, and distilled 
with sulphuric acid until all the volatile acids had come 
over. This acid distillate was exactly neutralised with 
barium hydrate solution, evaporated to dryness, the barium 
salt prepared in the usual way, and dried at 110°C. On 
ignition with sulphuric acid 90°67? of barium sulphate was 
obtained. As the theoretical amount for barium acetate 
should be 91°35% it is evident that a small amount of a 
volatile acid of higher molecular weight was present. 
During the distillation and preparation of the acids, there 
was a marked odour of butyric acid, so that probably it is 
that acid which is present with the aceticacid. The barium 
