30 = CATEGORIES OF CLASSIFICATION. 
CHAPTER III. 
CATEGORIES OF CLASSIFICATION. 
From the time that Linneus showed us the 
necessity of a scientific system as a framework for 
the arrangement of scientific facts in Natural 
History, the number of divisions adopted by zo- 
ologists and botanists increased steadily. Not 
only were families, orders, and classes added to 
genera and species, but these were further multi- 
plied by subdivisions of the different groups. But 
as the number of divisions increased, they lost in 
precise meaning, and it became more and more 
doubtful how far they were true to Nature. 
Moreover, these divisions were not taken in the 
same sense by all naturalists: what were called 
families by some were called orders by others, 
while the orders of some were the classes of oth- 
ers, till it began to be doubted whether these 
scientific systems had any foundation in Nature, 
or signified anything more than that it had 
nleased Linneus, for instance, to call certain 
groups of animals by one name, while Cuvier 
had chosen to call them by another. 
