al Science—so that the dedication of this. ve 
% 
To JOHN GEORGE CHILDREN, ree es 
BPRS: L. & BS 
Tue kindness which a traveller receives when in a | 
distant land, must ever be among his most pleasing 
recollections—your attentions therefore to me, during 
my short residence in London a few years since, can- 
not easily be forgotten. Suffer me, then, to inscribe 
this little work to you as a token of my gratitude. 
Our pursuits in the Natural and Physical Sciences 
have been congenial. Your interesting researches 
with your original and magnificent Galvanic Battery, 
first drew my attention to the calorific effects of that 
mysterious agent; and your works on Natural His- 
tory have stimulated my exertions in the same fasci- 
nating pursuit. 
A large portion of your time and fortune have been 
devoted to the patronage or the cultivation of Natu- 
Mora 
- you, if it were mie more wort a eu 
_ ance, would be ue from me, both as a Tibult of 
espect, as well as of grateful acknowledgment. 
Philadelphia, October 1st, 1832. 
