Vauquelin on Compounds of Acetic Acid and Oils. 425 
The proportion of the elements of this acid is very different 
then from that which M. M. Gay Lussac, Thenard, and Ber- 
zelius have found for citric acid. But what is remarkable, says 
M. Lassaigne, its capacity for saturation is nearly the same as 
that of citric acid, as we may see by casting our eyes on the 
analyses of the pyrocitrates of lime, barytes, and lead, which 
we have given, and which we have convinced ourselves of by 
frequent verification. Nevertheless, in the combinations of this 
new acid, the ratio of the oxygen of the oxide, tothe oxygen of 
the acid, is in a different proportion from that admitted for the 
neutral citrates ; we observe that in the pyrocitrates the oxygen 
of the base is to that of the acid as 1 to 3.07; whilst in the 
citrates it is as 1 to 4.916. 
The author seems here to have miscalculated strangely. Tak- 
ing his analysis of pyrocitrate of lime and of pyrocitric acid, we 
have 
34 acid, which contain 14.6 of oxygen, 
GGtlims Lop hie Vier 18.6 of oxygen ; 
so that the oxygen of the base is to that of the acid as 1 to 0.785, 
instead of 1 to 3.07. 
In fact, the pyrocitrate of lime result makes the atom of acid 
referred to Dr. Wollaston’s scale to be 18.3; that for pyroci- 
trate of barytes, makes it 76.5, and that for pyrocitrate of lead, 
70. The only supposition we can form is, that the numbers for 
the calcareous salt are inverted in the Journal de Pharmacie ; 
and that they ought to be, 
Rinte wen .hove tt ee BAL Wh ae 34 
In this case the atom comes out 69.0; a good enough ac- 
cordance with the above. Were the equivalent of the acid 
66.25, then it might consist of 
Carbon 4 atoms. . = 30.00 45.27 
OXY¥oen 8 ius 0 so, == GU.0U 45.27 
Hydrogen5 ..... = 6.25 9.46 
66.25 100.00 
Experiments on the Combination of Acetic Acid and Alkohol 
with the Volatile Oils. By M. Vauquelin*. 
First experiment: 80 measures of volatile oil of lavender 
were mixed with 80 measures of acetic acid, marking 10° of 
the areometre (1.072). After a brisk and long agitation, to 
effect the mixture of the two liquids, they were left in repose. 
* Annales de Chimie et de Phys,, xix., 279. 
