is a good and sufficient reason for believing that the
problems of science, when they come to be sufficiently
understood, can be arranged in hierarchical order, that is,
so that any two problems either depend the one on the
other, and not conversely, or both depend upon the so-
lution of one problem, which does not depend upon both.
There is, of course, a large assumption here, namly that there
is some one first problem, antecedent to all others. [?]
this may be presumed true will be a matter for serious
inquiry. Meantime, the assumption may stand as a pro-
visional hypothesis, taken on probation.

But even granting that scientific problems could be
arranged in hierarchical order, it still remains to inquire
where in the scale we are to draw the lines between the dif-
ferent sciences. Before undertaking to answer this question
in detail, everybody will agree that we ought to determine
what the general character of our divisions is to be; and

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