For my own part, I may be allowed to observe that the English Edition was undertaken by the express desire of Professor Liebig, who kindly recommended its being intrusted to my care. The Author has supplied me with many corrections, and some additions, and the hope is shared by us in common that it will facilitate the study of analytical chemistry to the English student, and in every way serve to promote the interests of the science.

22, CONDUIT STREET,

October 1, 1843.

J. LLOYD BULLOCK.