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I with £o observe, preparatory to practice,
that perspeCtive may be considered under two
ideas (i) as Direct (2) as Reslective. To
explain myself; I beg you to consider, that
when you survey objeCts, os what nature soever
(whether a simple lawn, or an extensive cham-
pain) they appear before you if seen through a
transparent medium, or glafs window; but, if
you see them in a mirror, although their gene-
ral effect is the same as before, and their veri-
simility almoil as decisive, yet in some respeCts
they differ. The slab which is under that
looking-glass, demonstrates this matter: in
looking at the slab itsels (which we term an
original object) we observe that its front is,
and appears to be neareit to us ; whereas in
the glass, it is farthest off. This lady’s fan
which I lay open on the ssab, appears in the
original object to be situated with the cir-
cular edge of the mount furthest from us,
and the handle neareit to us j but in the glass,
the mount seem's to approach, and the handle
to recede $ correspondent to this effect, you
see the ornamental figures on the mount are
inverted. This ressective quality, enables the
glass to exhibit a most perfeCt picture of sur-
rounding objeCts, and when objeCts thus ex-
hibited are correspondently similar, we are
hardly