TO 



CHARLES G. B. DAUBENY, M.D., F.R. L. 8c G.S., 



PROFESSOR OF CHEMISTRY AT OXFORD, 



THIS VOLUME 



IS DEDICATED, 



AS A GRATEFUL REMEMBRANCE OF HIS 



KINDNESS AND FRIENDSHIP, 



AND AS A TESTIMONY OF THE SINCERE ESTEEM OF 



THE AUTHOR. 



London, Dec. I, 1833. 



