Vlll 
PREFACE. 
tion, correction or alteration that may appear to be neces- 
sary, in order that it may be employed in the preparation 
of a future edition, as it is only through such assistance 
that the Flora of an extensive country can attain to even a 
moderate degree of perfection. 
St. John’s College, Cambridge, 
April 21, 1847. 
