CONTENTS. 
No. I. 
ORIGINAL COMMUNICATIONS. 
Boullay's Filter and System of Displacement, with observations 
drawn from experience. By Augustine Duhamel, - 1 
Observations on some of the Camphoriferous Essential Oils, and 
on the Resins evolved from some of the Volatile Oils, by 
their reaction with Sulphuric Acid. By William Proc- 
ter, jr. 17 
Notes on Falsifications and Adulterations, No. II. - 24 
Notice of the true Jalap Plant, ----- 28 
SELECTED ARTICLES. 
Notices of the Clove and Cinnamon. By W. S. W. Ruschen- 
berger, M. D. - - - - - 30 
Some facts contributing to the Pharmacological History of Quas- 
sia. By M. Planche, ... 35 
On Quassit. By Mr. Wiggers, ----- 42 
Extract from a paper on a New Method of Analysis for the esti- 
mation of the principal constituents of Organic Matters. 
By M. Persoz, 43 
Note on the Bark of the Be-Lahe, or Costus Amer. By M. Gui- 
bourt, - - - - - 47 
Note upon the Preparation of Simple Plaster. By M. Beral, 
Pharmacien, ------ 48 
Extract from a paper on Phloridzine. By T. Boullier, - - 51 
On Cetrarine. By Dr. Herberger, - - - - 54 
Observations on the Process of James Marsh, for the Separation 
of small quantities of Arsenic from mixtures containing it, 58 
