He is busying himself with _things_--the same things that interest the plain man, and of which the plain man knows something.

He has collected information touching their properties, their changes, their relationships; but to him, as to his less scientific neighbor, they are the same things they always were,--things that he has known from the days of childhood.
Perhaps it will be admitted that this is true of such sciences as those above indicated, but doubted whether it is true of all the sciences, even of all the sciences which are directly concerned with _things_ of _some_ sort.

For example, to the plain man the world of material things consists of things that can be seen and touched.

Many of these seem to fill space continuously.

They may be divided, but the parts into which they may be divided are conceived as fragments of the things, and as of the same general nature as the wholes of which they are parts.