24 
ORIGINAL COMMUNICATIONS. 
Prof. Hare has suggested that those oils which contain the 
largest amount of oxygen, are the most readily oxidized, 
which accords with my experience ; nevertheless, those 
which are admitted to contain no oxygen, (copaiba for 
instance,) also yield resins; hence we are led to the belief that 
the oxygen required in the generation of this class of resins, 
is obtained principally at the expense, either of the acid or 
its water. 
ART. III.— NOTES ON FALSIFICATIONS AND ADULTERA- 
TIONS.— No. II. 
Since writing the first number of this series, (vol. ix. 
p. 17,) I have been looking for some of my fellow members of 
the College of Pharmacy, to lend the aid of their pens, in 
support of what appears to be one of the most necessary and 
most legitimate objects of this Journal, and of the attention 
of the College. But as no second number has yet made its 
appearance, I conclude that most others, like myself, find it 
more agreeable to sit still and say nothing, than to tell whole- 
some truths, which may grate upon the ear. I still hope, 
however, that the third number will be contributed by some 
pen better qualified than my own ; and in the mean time 
have thrown together a few facts which have occurred at 
various periods during the past year. 
Oxide of Zinc. — It would be well for our apothecaries, 
generally, to examine their articles under this name. Proba- 
bly few would find, on adding sulphuric or muriatic acid, that 
there was not a copious effervescence of carbonic acid ; and 
it appears that in some instances even carbonate of lime has 
