I am Sir,

Your obliged and obedient servant,

H. DAVY.

Mr. T. Packer,

Stamford Street, Black-Friars Road.

The author has only to add, that an Index is now appended to the work, by which every article may be most readily and conveniently found.

London, Nov. 1829.

ERRATUM.

Page [22], line 3, for proximate read ultimate.