It summarises the history of species; ontogenesis, we are told, reproduces phylogenesis.
"A New Philosophy: Henri Bergson" by Edouard le Roy
A similar connection determines the relation between ontogenesis and phylogenesis.
"Three Contributions to the Theory of Sex" by Sigmund Freud
But ontogenesis would have furnished us with facts no less cogent.
"Creative Evolution" by Henri Bergson
It is naturally no easy matter to trace the ontogenesis of the herd instinct.
"Group Psychology and The Analysis of The Ego" by Sigmund Freud