_Wealthy men_. These two words express two ideas as
related. We have learned to know this relation by the form and position of
the words. Change these, and the relation is lost--_men wealth_. But by
using _of_ before _wealth_ the relation is restored---_men of wealth_. The
word _of_, then, shows the relation between the ideas expressed by the
words _men_ and _wealth_.
All such relation words are called +Prepositions+ (Lat. _prae_, before, and
_positus_, placed--their usual position being before the noun with which
they form a phrase).
A phrase introduced by a preposition is called a +Prepositional Phrase+.
This, however, is not the only kind of phrase.
+DEFINITION.--A _Phrase_ is a group of words denoting related ideas, and
having a distinct office, but not expressing a thought+.
+DEFINITION.--A _Preposition_ is a word that introduces a phrase modifier,
and shows the relation, in sense, of its principal word to the word
modified.+
Analysis and Parsing.
1. The pitch of the musical note depends upon the rapidity of vibration.
TO THE TEACHER.--See suggestions in Lesson 12, concerning the use of
diagrams.
pitch depends
==========|=================
\The \of \upon
\ \
\ note \ rapidity
\-------- \------------
\the \musical \the \of
\
\vibration
\---------
+Explanation+.
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