490 CONTENTS OF THE

tion ſhewn from the ſweetneſs of the lap; no umbilical artery in vegetables.

NoTE XXXV1.--VEGETABLE CC IRCULATION.

Bubs ſet in the ground will grow if prevented from bleeding to death by a cement; vegetables require no muſcles of locomotion, no ſtomach or bowels, no general ſyſtem of veins; they have, 1. Three ſyſtems of abſorbent veilels; 2. Iwo pulmonary ſyſtems; 3. Arteria] iyltems; 4. Glands; 5. Orgäns of re-produdion; 6. Muſtles. 1. Abſorbent ſyſtem evinced by experiments by coloured abſorptions in fig-tree and picris; called air veſſels erro- neouſly; ſpiral ſtrutture of abſorbent veſſels; retrograde motion of them like the throats of cows. II. Pulmonary arteries in the leaves,„and pulmonary veins; no general ſyſtem of veins Ihewn by experiment; experiment tending . confirm the exiſtence of ſuch a lyitem: no heart; the ar- teries act like the vena portarum ofthe liver; pulmonary ſyſtem in the petals oi Nowers; circulation owing to liv- ing Irritability; vegetable abſorption more powerful than

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animal, as in vines; not by capillary attraction.

NoTE NAXVIL=-VEGETABLE RESPIRATION.

I. Leaves not perſpiratory organs, nor excretory ones; jungs of animals. 1. Great ſurfaces of leaves. 2. Vege- table blood changes colour in the leaves; experiment wich ipurge; with picris. 3. Upper ſurface of the leaf only acts as a reſpiratory organ. 4. Upper ſurface repels moiſ- ture; leaves laid on water. 5. Leaves killed by oil like InſeCts; muſcles at the foot ſtalks of leaves.“ 6,.Uſe of light to vegetable leaves; experiments of Prieſtley, In- genhouz, and Scheele, 7. Vegetable circulation ſimilar