6.Sur la relation problématique entre causes et conditions, voir d'une manière générale : J. S. Mill, A System of Logic Ratiocinative and Inductive, Being a Connected View of the Principles of Evidence and the Methods of Scientific Investigations, livre III, chap. V, par. 3 , dans The Collected Works of John Stuart Mill, publié sous la direction de J. M. Robson (1974), VII, p. 327.
6.关于起因
条件之间的复杂关系,可泛泛参阅:J.S. Mill,A System of Logic Ratiocinative and Inductive,Being a Connected View of the Principles of Evidence and the Methods of Scientific Investigation,Book III,Ch. V,§ 3 ,in J.S. Mill, The Collected Works of John Stuart Mill,ed. J.M. Robson(1974),VII,at p.327。