24-9 
nations of structure with the least possible difficulty, 
and in the most natural order. Unfortunately, the 
Linnaean method is not well suited to this purpose ; 
for being founded chiefly on an attention to external 
characters, with little or no regard to anatomical 
structure, it has, in many cases, associated together 
animals, whose general form and habits are essential- 
ly different, and in whom no common anatomical 
characters can with propriety be said to reside. 
534. Since the time also of Linnaeus, great addi- 
tions have been made to this department of natural 
history ; and the anatomical resemblances and differ- 
ences in animals have been studied with a degree of 
zeal and success, unknown at any former period. 
Many improvements have, in consequence, been in- 
troduced into our systems of arrangement ; and the 
French naturalists, who have laboured in this field 
with distinguished ability, have been induced, not 
merely to propose numerous alterations in the classes 
of animals, already established, but to institute 
other classes, which are entirely new. M. Cuvier 
has increased the number of classes, into which Lin- 
ngsus divided the animal kingdom, from six to nine. 
This he has done, by forming into distinct classes^ 
the Zoophytes and Mollusca, which ranked only as 
orders of the class Vermes in the arrangement of 
Linnaeus. He has, likewise, formed into a class, 
under the title of Crustacea, the genera Cancer and 
Monoculus,. which stand as an order in the Insect 
class of Linnseus. The writer of the article, " Clas- 
sification/' in Ihe last edition of Dr Rees's Cyclo- 
paedia, has followed Cuvier in the two former altera- 
