. Un manuel de la botanique médicale d'Amérique du Nord [microforme]. La botanique, médical ; botanique ; botanique médicale ; Botanique. Éléments de botanique. |m| PRINCIPES GÉNÉRAUX DE VÉGÉTAUX ET DE LA REPRODUCTION. Une connaissance de l'princii'les d'vegeLable aeqinrsd vie maj' être en examinant attentivement l'histoire de toute plante, si humble, de la germination de ses graines vers le haut à travers les différentes étapes de son développement à la formation et à la perfection de son fruit. Prendre, comme un familier et souvent utilisé à l'illustration, un jardin commun haricot (Fig. 1). Cette graine, nous le savons, est capable, dans de bonnes

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. A manual of the medical botany of North America [microform]. Botany, Medical; Botany; Botanique médicale; Botanique. ELEMENTS OF BOTANY. |M| GENERAL PRINCIPLES OF VEGETABLE GROWTH AND REPRODUCTION. A knowledge of the general princii'les of vegeLable life maj' be aeqinrsd by carefully studying the history of any plant, however humble, from the germination of its seed upward through the various stages of its develop- ment to the formation and perfection of its fruit. Take, as a familiar and often-used illustration, a common garden bean (Fig. 1). This seed, we know, is capable, under favorable circumstances, . Fui. 1. l''i(}. 2. Fill. 3. I'w. -1. Fig. 1.—A Uiiin. Fio. 2.—The suinc, with Roed-coat removoil. Fio. 3. —The Banic, with ouu st'od-lcaf re- move, ., showing uinbryo leaves. Fio. 4.—A beiin after germination. of developing into a plant like its parent, though its external appearance affoi'ds no hint of such hidden possibilities. Externally it is covered by a coating of horny hardness, everywhere smooth and glistening save at one point on its slightly concave side, where it was attached to the pod in which it grew. This point of former attachment is marked by a scar, termed the hilum, and, as will be shown later, is strictly analogous to the umbilical scar of animals. Removing now this external coating, the seed is seen to comprise two similar, symmetrical parts, joined bj' a small body of like texture, which is folded down along their line of apposition (Fig. 2). A more minute mi- croscropical and chemical examination would demonstrate other features of interest, biit foreign to our present purpose. Protected from moisture a bean may be preserved for years without change, and giving no sign of vitality, but planted in damp earth it speed- ily undergoes changes which are interesting and instructive. As it absorbs moisture the external coaling is ruptured, the two parts of the seed sepa- rate along their margins, and the small body joining them elongates

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