Neither in common life nor in science would the distinction between appearances and real things be of the smallest service were it not possible to distinguish between this appearance and that, and this reality and that, and to refer each appearance to its appropriate reality.

Indeed, it is inconceivable that, under such circumstances, the distinction should have been drawn at all.
These points ought to be strongly insisted upon, for we find certain philosophic writers falling constantly into a very curious abuse of the distinction and making much capital of it.

It is argued that what we see, what we touch, what we conceive as a result of scientific observation and reflection--all is, in the last analysis, material which is given us in sensation.

The various senses furnish us with different classes of sensations; we work these up into certain complexes.

But sensations are only the impressions which something outside of us makes upon us.