480/583 Mem. Nat. 2 page 270 et seq.) In 1815 also appeared the masterly dissertation of Professor Ludolf Christian Treviranus, on the development of the vegetable embryo,* in which he describes the ovulum before fecundation as having two coats: but of these, his inner coat is evidently the middle membrane of Grew, the chorion of Malpighi, or what I have termed nucleus. |