23. If the fact of abiogenesis is proved, however limited it may be, it is no less a capital fact, a steady beacon-light on the way to new discoveries. If complex organic beings are produced in this manner, who knows how they have obtained their origin? Who knows the secret of all transformations? When one regards the oak and the acorn, who can say if a mysterious tie does not exist between the polyp and the elephant? (n° 25). From our current state of knowledge we cannot thus far establish the theory of permanent spontaneous generation, expect as a hypothesis; however a hypothesis that will perhaps in the future take a prominent place among the incontestable scientific truths. *
*« Revue Spirite, » July 1868, page 201: Development of the Theory of Abiogenesis.