NOTES AND ILLUSTRATIONS. 255

presupposed. When, therefore, he affirms labour itself to
be a common measure of value, he makes a transition to
the other sense of the phrase, and means, that when the
quantities of labour respectively required to produce com-
modities are known, their values in relation to each other
are thereby determined.

This distinction, constantly borne in mind, would, I am
persuaded, throw great light upon the obscurity which
clouds many discussions in political economy, and clearly
show the source whence it has proceeded.

THE END.