PE RES AL

Reprefents the fpiral veffels of 2 vine-leaf confiderably magnified, copied from Grew, Tab. LI. On flowly tearing afunder almoft any tender vegetable fhoot or leaf, the fpiral ftruéture of thefe veffels becomes vifible to the naked eye. They have been er- roneoufly believed to be air-veflels; but as they exift equally in the roots of plants, as in their barks, and have no communication with the horizontal perforations of the cuticle of the bark, they cannot be air-veflels, and are therefore believed to confitute the ab- forbent veffels of the adult vegetable, and the umbilical ones of the embryon bud. A fimilar plate of the fpiral ftruéture of thefe veffels is given by Duhamel. As they are larger than the vegetable blood-veffels, and pafs along the whole caudex of each bud from its plumula to its radicle, as well as to the cutaneouf abforbents, thofe of the trunks of trees or herbaceous plants may be thought to refemble the receptaculum chyli of ani- mal bodies, See Set. II. 7.

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