13vThe PREFACE.
The Practice of Perſpective may be made
eaſy, by the Three following Things in this
Treatiſe: Viz. 1. In giving ſeveral new
and eaſier Ways (than thoſe commonly uſed)
of ſolving the moſt general Problems upon
which the whole Practice is founded: And the
Reaſon why we have laid down ſeveral So-
lutions, is, becauſe the ſame Way is not always
equally convenient in all Caſes; whence it is
neceſſary to have ſeveral, that ſo we may
chuſe one beſt ſuiting our Purpoſe. 2. The
general Methods, which have been us’d hi-
therto, not being practicable on ſome particu-
lar Occaſions; to remedy this, we have ad-
ded others to them; which are indeed more
difficult, but (in ſome Caſes) there is an ab-
ſolute Neceſſity for them. 3. When it is ve-
ry difficult to reſolve a particular Problem,
by means of general ones; then we have
thought it convenient to give a particular So-
lution thereof.
eaſy, by the Three following Things in this
Treatiſe: Viz. 1. In giving ſeveral new
and eaſier Ways (than thoſe commonly uſed)
of ſolving the moſt general Problems upon
which the whole Practice is founded: And the
Reaſon why we have laid down ſeveral So-
lutions, is, becauſe the ſame Way is not always
equally convenient in all Caſes; whence it is
neceſſary to have ſeveral, that ſo we may
chuſe one beſt ſuiting our Purpoſe. 2. The
general Methods, which have been us’d hi-
therto, not being practicable on ſome particu-
lar Occaſions; to remedy this, we have ad-
ded others to them; which are indeed more
difficult, but (in ſome Caſes) there is an ab-
ſolute Neceſſity for them. 3. When it is ve-
ry difficult to reſolve a particular Problem,
by means of general ones; then we have
thought it convenient to give a particular So-
lution thereof.
By this means, the Study of Perſpective
becomes indeed more difficult; but the Diſ-
advantage is well recompenſed by the Faci-
cility of the Practice, which we have entire-
ly had in view. It is true, that a few ge-
neral Rules do not ſo much burthen the Me-
mory; but when one has ſeveral general
ones, and alſo particular ones, by them we
can abridge Matters. And this Method
becomes indeed more difficult; but the Diſ-
advantage is well recompenſed by the Faci-
cility of the Practice, which we have entire-
ly had in view. It is true, that a few ge-
neral Rules do not ſo much burthen the Me-
mory; but when one has ſeveral general
ones, and alſo particular ones, by them we
can abridge Matters. And this Method