lv PREFACE. 
The letters of the Bishop of Carlisle, fol- 
lowing the chapter upon Sir James’s works, 
being chiefly critical, and relating to those 
publications, are kept together, that the sub- 
ject may not be interrupted. 
The correspondence of Mr. Davall and 
Sir James is kept separate from the general 
current of letters, as it relates principally to 
the botany of Switzerland, and their peculiar 
regard for each other. That of the Marchio- 
ness of Rockingham, their mutual friend, is, 
for similar reasons, mingled with theirs. 
The letters of Mr. Caldwell, of Dr. Wade, 
&c. are inserted together, being descriptive 
of Ireland chiefly. 
Those of the Abbé Corréa De Serra and 
a few other friends have a reference to some 
political occurrences in Portugal which af- 
fected the Abbé’s safety ; and among them 
are a few concerning a magnificent plant, 
the Cyamus Nelumbo, whose history has been 
a subject of interest and speculation with 
classical botanists. 
The correspondence of Mr. Roscoe and 
