Page 113

                              EFORE entering U~0fl the study ol
                              Perspective, some degree of prepara-
                                - knowledge of the first principles
                              of Geometry is requisite, especially of
                              such as relate to the construction of
                              the most important mathematical fig-
                              tires and forms: in the acquirement of
     /
                              which the student will necessarily be
                              made familiar with the use of certain
instruments, which will be found greatly to facilitate his practical operations,
and, to which,
although it may not be absolutely necessary to have constant recourse, still,
the surest way of
learning to do without them is first to acquire a practical knowledge of
their use and value.
Although, all the rules and principles of Perspective are~ in truth, based
upon and connected with
Geometry, it will be sufficient that the artist and off-hand draughtsman
should understand so much
of that science as may be immediately connected with his art, without entering
into the more
laborious investigation of causes and effects, however interesting and productive
of mental strength
may he its further pursuit.  It will, therefore, be only necessary to present
a short chapter on this
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