[23] Réaumur, Hist. des Insectes, Vol. V., Mém. viii.
[24] Darwin, Origin of Species, chap. vii.
[25] Vol. III., Mém. iv.
[26] Hist. Nat., Vol. IV.
[27] The first edition of the Nouvelles Observations sur les Abeilles (1792) was the work of François Huber alone; the second (1814) was prepared by Pierre with the co-operation of his father, and is here credited to the son.
[28] Hist. Animalium, VIII., i.
[29] Huxley's Hume, chap. v. Some few naturalists, who are entitled to respectful attention, such as Father Wasmann, author of The Psychology of Ants, do not even now receive the conclusions of Hume.
[30] Lloyd Morgan, Habit and Instinct, Introduction.
[31] Phil. Trans., 1904.