SECT AL 7. OF-sAUDS. 7

of plants by buds, or to their fexual or oviparous propagation by feeds.

Seventhly, longitudinal mufcles to turn their leaves to the light, and to expand or clofe their petals or their calyxes; and vafcular mufcles to perform the abforption and circulation of their fluids, with their attendant nerves, and a brain, or common fenforium, be- longing to each individual feed or bud; to each of which we fhall appropriate an explauatory feétion.

7. An embryon bud, therefore, whether it be a leaf-bud or a flower- bud, is the viviparous offspring of an adult leaf-bud, and is as indivi- dual as a feed, which is its oviparous offspring. It confifts, firft, of a central organization or caudex like the corculum of a feed, which contains the rudiments of arteries, veins, abforbent veflels, and glands, with an internal pith or brain.

Secondly, it is furnifhed with a fyftem of umbilical veffels, which aré inferted into the alburnum or fap-wood of the tree, or form a part of it, and defcending into the earth fupply it in the early fpring with its firft nutrition, like the feminal roots, fo called, which pañfs from the corculum of the feed, and are fpread on the cotyledons, as feen in the garden bean, reprefented in Plate I. Fig. 1. which is taken from Dr. Grew’s Anatomy of Plants.

Thirdly, this umbilical fyftem probably contains alfo what may be termed a placental artery, terminating on the coats of the lateral air- veflels, which penetrate the bark of trees horizontally, for the pur- pofe of oxygenating the blood of the vegetable fetus, like thofe dif- tributed from the umbilical veflels of the chick on the air-bag at the broad end of the ege. See Set. IT. 4. and TTL. 1—4.

Fourthly, it contains the rudiments of organs adapted to lateral ge- neration or the production of new buds; or to fexual propagation, and the confequent produétion of feeds.

In the early fpring the umbilical vefels fupply the embryon buds of trees with fap-juice, which is then feen to exfude from wounds of

I the