chology  belongs  the  determination  of  the  exact
distinction  between  the  sensitive  and  the  non-sensi-
tive faculties  of  the  mind,  and  of  their  mutual
dependence  on  each  other,  and  though  the  two
sciences  have  a  certain  amount  of  common  ground,
yet  we  may  say  in  general  that  Psychology  is  con-
cerned with  all  the  operations  of  mind  in  its  widest
sense,  while  Logic  is  concerned  only  with  those
which  contribute  to  correct  thinking.
Nor  is  Logic  concerned  with  the  objects  about
which  we  think,  except  in  so  far  as  they  are  repre-
sented in  the  thinking  mind.  Regarded  in  them-
selves they  fall  under  the  domain  of  Metaphysics,
which  investigates  the  inner  nature  of  things,  and
regards  them  as  in  themselves  they  are.  The
science  of  Metaphysics  determines  the  nature  of
various  forms  of  being,  of  essence  and  substance,  of
cause  and  effect,  of  goodness,  unity,  and  truth.  It
treats  of  that  which  lies  outside  the  mind,  and
contemplates  it  in  its  objective  reality.  Logic,
on  the  other  hand,  treats  of  that  which  is  within
the  mind  only,  and  contemplates  it  in  so  far  as  it  is
a  part  of  the  intellectual  furniture.
But  is  it  within  the  province  of  Logic  to  decide
on  the  reliance  to  be  placed  on  our  thoughts,  or
their  trustworthiness  as  representations  of  the
internal  objects  about  which  we  think?  Here
we  come  on  an  important  distinction  between  the
two  parts  of  Logic.
i.  Formal  Logic  has  a  limited,  though  a  most
important  province.  Its  jurisdiction  is  confined  to
those  thoughts  which  already  exist  within  the  mind


FORMAL  AND  MATERIAL  LOGIC.
