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Show VEGETABLE PLACENTATION. NoTE XXXV. After a time, perhaps about midfummer, another bundle of veffels pafles from the pith through the alburnum or fap-veffels in the bofom of each leaf, and unites by the new bark with the leaf, which becomes either a flower-bud or a leaf-bud to be expanded in the enfuing fpring, for which purpofe an apparatus d placental veffels are produced with proper nutriment during the progrefs of the fummer and autumn, and thus the vegetable becomes annually increa fed, ten thoufand buds often exifl:ing on one tree, according to the efl:imate of Linneus. Phil. Bot. The vafcular conneClion of vegetable bud with the leaves in whofe bofoms they are formed is confirmed by the following expe riment, (Ott. 2o, 178r.) On the extremity of a young bud of the Mimofa (fenfitive plant) a fmall drop of acid of vitriol was put by means of a pen, and, after a few feconds, the leaf in whofe axilla it dwelt clofed and opened no more, though the drop of vitriolic acid was fo fmall as apparently only to injure the fummit of the bud. Does not this feem to !hew that the leaf and its bud have connecting veffels though they arife at different times and from different parts of the medulla or pith? And, as it exifl:s previoufly to it, that the leaf is the parent of the bud? This placentation of vegetable buds is clearly evinced from the fweetnefs of the rifing fap, and from its ceafing to rife as foon as the leaves are expanded, and thus compleats the analogy between buds and bulbs. Nor need we wonder at the length of the umbilical cords of buds fince that mufl: correfpond ;with their fituation on the tree, in the fame manner as their lymphatics and arteries are proportionally elongated. It does not appear probable that any umbilical artery attends thefe placental ab-forbents, fince, as there feems to he no fy!lem of veins in vegetables to bring back the blood from the extremities of their arteries, (except their pulmonary veins,) there could not be any vegetable fluids to be returned to their placenta, which in vegetables feems to be fimply an organ for nutrition, whereas the placenta of the animal fcetus fcems likewife to ferve as a refpiratory organ like the gills of fifhes. ' 99 NOTE XXXVL-VEGETABLE CIRCULATION. And rt'jluent blood in milk"v./ edd"t es [Ll ends. C . . . . ANTO JV. J. 420, THE tndtv.t d•u a!tty of veget:tble bu c1 s was rt p o ke n of b f, . method of ratflllg all kinds of trees b M. B e ore, and ts confirmed by th T L y 1 • arnes (M th l f e rces. I759· ond. Baldwin.) He cut a b h. · e O< 0 propagating Fruit I . ranc mto as many . or eav s upon It, and wiping the two wo d d d ptecesastherewerebuds · un e en s dry he · 11 cement, prevlOuO y warmccl a little h. I qutc < y applied to eacl ' w !Cl confiO:ed · . 1 a them in the earth. The ufe of this ceme t I {i pnnctpally of pitch, and planted bud from bleeding to death, though the au~ho {i~P_Pbofe. to c~nfift in its preventing the 1'1 tetre b ud s of plants, which are th h rac. n . e.s tttotts an t'Il ie ptt.c quality. ft [i . . . us eac an tnd!vtdual veg t bl . ances re emble 111d1VIdual animals b t . . c a c, tn many circum d ' u as ammal bodtes :ue d I d f 4 an move from place to place in {( h f f . etac le rom the earth . . earc o ood, and take tl f, d ' Intervals of ume, and prepare it for tl . 'lh lat oo at confiderablc . . k le!r noun ment within th . Jt ts ta en, it is evident they muft . etr own bodies after .rr. require many organs a d . necellary to a fl:ation:try bud A , bl . n powers whJch are not I . s 'cgeta es are tmmoveabl fi d . \\ lence they draw their nourifhment , d y xe to the foil from · rc:a Y prepared a d th · · fi mtcrv:tls, it follows that in examing th . ' n IS unt ormly not at returning I . . ctr anatome we are not to 1 k {i ocomotwn, as arms and. legs . nor f, . oo or mufcles of ~ , or organs to recctve and p h . as a fl:omach and bowels . nor fo . {i . c . repare t etr nourifhment, f n. . ' r a te ervOtr lOT Jt after it is p d ytLem of vcms, which in locomotive anim I . repare ' as a general which is left after the various org f fc as ~onta!lls and returns the fuperfluous blood . ans 0 ecretwn have been fu r d b h' h tnvance they arc enabled to live a lo . . h pp IC ' y w lC con. Th I . ng time Wit out new fupplies of food e parts w uch we may expett to fi d . I . to thofe in the animal econom n m t le anatome of vegetables correfpondent rnoifture of the earth fimilar to~ are, I. A fyftem .of abforbent veflels to imbibe the fyfl:em of abforbcnts fimilar to t~e l;Clea~ v~ffels, t ~~ the roo~s of plants; and another on the i nt . c ymp attcs o ant mal boriJes, opening its mouths r b e! nal cells and external furfaces of vegetables . aud a third fylle f b wr ent velfds corrcfip d . h h r ' m o a - I f on Clll Wit t Ole of the placentation of the animal fretus 2 A tphu mft o'nda ry yft em con.e fip on de nt to the lungs or gills of quadrupeds and filh by •w h·i ch h e ~~ ab.for~ed by the latleals and lymphatics may be expofed to the i~ftuence of t ed athr , {i tht. s IS done bY t1 le green 1e aves o f plants, thofe in the air refembling lungs ;1~ t 0 c 111 the water rcfembling gills ; and by the petals of flowers. 3· Arteriaj Yh ems to conv~y the fluid thus elaborated to the various glands of the vegetable for t e purpofes of Its rrrowrh · · d ·. {i . h . o , nutntwn, an varwus ecretwns. 4· The various glands W IC:h. f,e p~ratc f r m the vegetable blood the honey, wax, gum, reJin, fiarch iugar effcnt!:tl od &c 5 Tl ,,, . . ' ' 6 ' · · 1e organs a4.1pted for their p1opagauon or reproduClion.- • Mufcles to perform feveral motions of their parts. Nl |
