PREFACE. 
Some few years ago Mr. Loudon wrote to me, 
in order to draw my attention to his Magazine 
of Natural History ; and he added in his letter, 
that he would feel obliged to me for any com- 
munication that I might send to him from time 
to time at my convenience. 
I was preparing to set out for the Continent 
at the time that I received Mr. Loudon’s letter. 
On my return home from Franconia, I did 
not forget his application relative to the Maga- 
zine of Natural History. 1 owe a debt of gra- 
titude to Mr. Loudon, for the very kind manner 
in which he has always spoken of the Wan- 
derings, and recommended that work to the 
public. 
I had learned, by mere chance, that a pro- 
fessor in King’s College had been applying to 
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