rly
manner; or if it could do so once, cannot be supposed capable of doing
it a second time in a precisely similar manner, not to say capable of
doing it countless thousands of times.

If we go into a great museum our first idea, perhaps our last, concerns
the arrangement found therein. But it may safely be said that no sane
person ever entertained that idea without being perfectly aware that the
arrangement was made by human hands, controlled, in the last resort, by
the brain of the curator of the museum. Now, in a sense, the living body
is a museum containing specimens of different kinds of cells. There are
brain-cells, liver-cells, bone-cells, scores of different varieties of
cells, and all of them, so to speak, are arranged in their appropriate
cases.

If we go to the brain-case we can search it through and through without
finding a liver-cell, any more than we should find a typical brain-cell
embedded in the marrow of one of the bones. The different specimens all
occupy their appropriate positions. How did they get there? The future
animal, like animals of all kinds, including man, commences as a single
cell. All save a few interesting but at present negligible cases are
composed of elements drawn from male and female parents. This cell
divides up into a multitude of others. At first these are to all
appearances identical, but later they begin to differentiate, at first
into three classes and afterwards into the multitude of different cells
of which the body is composed. Further, these groups of cells become
aggregated in appropriate groups, cells of one kind uniting with cells
of the same kind and with no others. Here we have to do with
arrangement, consummately skilful arrangement, an arrangement which
practically never fails, for, leaving aside the case of monstrosity, a
consideration of which would detain us too long, not merely are the
various cells all placed in their proper positions, as we have seen, but
their aggregation, the individual, is so formed as to belong to the
proper compartment of that large museum, the world--the same compartment
as that occupied by his progenitors. Neither the particulate nor the
chemical theories help us here. The mnemic would, but it has its initial
and insuperable difficulty, pointed out in another article in this
volume, that, as you must have an experience before you can remember it,
it in no way accounts for the first operation of arrangement. As to the
material explan