iv PREFACE. 
stone and E. Forbes; also from Sir David Brewster, Sir John 
Lubbock, Sir John Richardsoa, James Dixon, Esq., J.J. Bennett, 
Esq., Col. Sabine, and from Dr. W. Francis, upon whose aid 
I have principally depended. 
The succeeding Part, to commence a Fifth Volume, is already 
in preparation ; and I trust I may be enabled to continue the 
work acceptably to the public, as valuable materials shall 
present themselves. 
RICHARD TAYLOR. 
London, Dec. 24, 1846. 
