But  in  speaking  of  art,  we  should  never  forget  her  twin  sister
science,  nor  should  we  forget  that  their  usefulness  and  their  in-
fluence depend,  in  a  great  measure,  upon  their  preserving  intact
the  bonds  of  sisterhood.  They  are  mutually  dependent  upon
each  other,  for  either,  without  the  other,  would  be  far  more
circumscribed  in  her  influence.
For  our  purpose,  science  may  be  distinguished  like  art  into
two  kinds,  natural  science  and  moral  science.  The  former  in-
fluences civil  liberty  through  the  assistance  she  renders  to  the
useful  arts  by  explaining  the  various  phenomena  of  the  natural
world,  upon  which  many  of  the  arts  depend,  and  by  furnishing
rules  by  which  flieir  processes  are  conducted.  Thus  the  art  of
navigation  depends  principally  upon  the  science  of  astronomy,
and  so  of  nearly  every  branch  of  art.
Moral  science  renders  service  to  society  and  to  civil  liberty,
in  that  her  object  is  a  proper  understanding  of  the  human  mind


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nm-  ~raf  ^^jati  ^itfaassaoa  to  petfiuBi.
