and Mineralogy. . 337 
6. Why no Systematic Nomenclature has yet ajrpeared.-^^llh^ 
want of a systematic nomenclature in mineralogy is capable of 
being accounted for. A systematic nomenclature presupposes 
a system, according to which it may be constructed (4.) Such 
a system has not hitherto been discovered. A mineralogical sys- 
tem must be natural historical, for mineralogy is a department 
of natural history. It must also depend upon a single prin- 
ciple ; for otherwise it would not be a system at all. A system 
resting on more than one principle would be deficient in unity 
and consistency ; and^ therefore, could not express the con- 
gruity that subsists throughout the productions of nature. 
Among all the mineralogical systems which have hitherto ap- 
peared, there has not been one of a natural historical character, 
or one grounded on a single principle. 
7. The Nomenclature has a reference to the nature of the 
science it is used m.— Chemical systematic denominations, when 
they appear in mineralogy, are altogether out of their proper 
place. These denominations, it is clear, express chemical re- 
lations, chemical connections of natural productions among each 
other, with which natural history, and consequently mineralogy, 
has no concern. The nomenclature is intimately connected with 
the nature of the science for which it is to serve. From the 
use of chemical names in mineralogy, it would follow that mine- 
ralogy must be a department of chemistry. But mineralogy is 
a department of natural history ; and that chemistry is natu- 
ral history, or natural history chemistry, will be maintained by 
no one, not even a partisan of the chemico-natural historical 
system of mineralogy. 
8. Its structure may be unfolded from the idea of it . — From 
the idea of a systematic nomenclature : ‘‘ That it is a verbal 
expression of natural historical connection subsisting among the 
productions of a series, or a verbal expression of the system 
which represents these connections,*'’— it is easy to unfold its 
structure. 
9. Names and denominations . — The word with which we 
designate a single object is called a name. This object may be 
such as to include a number of others. If the name has an 
epithet annexed, it is called a denomination. This denomina- 
