[1] We already endeavoured to make this philosophy known at its earliest
appearance, by an article that appeared in the _Revue des Deux Mondes_
of the 19th October, 1873, under the title, "A New Phase of
Spiritualism." We are now dealing with the most recent form of this new
school.
[2] Hamilton's "Discussions: Cousin, Schelling."
[3] Herbert Spencer's "First Principles," First Part p. 18.