CONTENTS. 
Chemical Examination of Gutta Percha. By J. G. Scott, - 141 
On a New Test for Prussic Acid, and on a simple Method of 
preparing the Sulphocyanide of Ammonium. By Professor 
Liebig, ------- 142 
On the Changes produced on some Drugs and Pharmaceutical 
preparations by the Solar Rays. By Mr. Robert Hunt, - 144 
Researches in Animal Chemistry. By Professor J, Liebig, - 149 
Minutes of the Philadelphia College of Pharmacy, - 154 
