des Sc.

de Paris 1711 page 210.) In 1718; Vaillant,* who rejects the vermicular hypothesis of generation, supposes the influence of the Pollen to consist in an aura, conveyed by the tracheae of the style to the ovula, which it enters, if I rightly understand him, by the funiculus umbilicalis: at the same time he seems to admit the existence of the aperture in the coat.
(*Footnote.

Discours sur la Structure des Fleurs page 20.) In 1745, Needham,* and in 1770, Gleichen,** adopt the hypothesis of Morland, somewhat modified, however, as they consider the particles in the grains of Pollen, not the grains themselves, to be the embryos, and that they enter the ovula by the umbilical cord.
(*Footnote.

New Microscopical Discoveries page 60.) (**Footnote.

Observ.Microscop.page 45 et 61 paragraph 118.) Adanson, in 1763,* states the Embryo to exist before fecundation, and that it receives its first excitement from a vapour or aura proceeding from the Pollen, conveyed to it through the tracheae of the style, and entering the Ovulum by the umbilical cord.
(*Footnote.