( iv ) 
These Plates, with their explanations, 
may be considered as an entire work; but it 
is presumed that they will be much more 
satisfactory when studied jointly with the 
Letters. 
Six plates are given to illustrate Rous¬ 
seau’s six letters upon the most remarkable 
Natural Classes. The rest are intended to 
explain the Classes of Linnaeus’s System in 
their order, except the thirty-fourth, which 
exhibits figures of the most remarkable Nec¬ 
taries. No general plate, explanatory of the 
classical characters, is given ; both because 
it has already been elegantly done by Mr. 
Curtis, and also may easily be collected from 
the particular plates of this work. 
Thus 
