Part

 1 I  |      all instances of what the human mind can effect by means
 2 I  | therefore best illustrate from human labour the most important
 3 I  |       just as the works of the human hand all need the moving
 4 I  |     exertion of the muscles in human labour, are alone what we
 5 I  |     between the effects of the human arm and those of machines.
 6 I  |      that this capacity of the human arm of being tired is only
 7 I  |        than in the case of the human arm.~From the feeling of
 8 I  |     either by the power of the human arm or by means of some
 9 I  |        an hour.~If, instead of human labour, we introduce the
10 II |      thus the more intelligent human force may be spared for
11 III|       the practical objects of human utility, but expresses a