ri:»t^' ^• 



PLATE 



I. 



. -»i 



Fig. I. reprefents the umbilical veffels fpread on the lobes of a bean, when it begins 

 to vegetate, as mentioned in Sea. I. 7. but more particularly defcribed in Se^l. III. 

 1.3; which are believed to confift of a fyftem of abforbent veffels, and another fyftem of 

 placental veffels, for the purpofe of acquiring nutriment, and of oxygenating the vege- 



table blood. The pi; 

 culum, c c the lobes. 



/. 



7 



Fig. 2. is copied from Malpighi, Tab. II. Fig. 6, and reprefents the longitudmal 

 fibres of the bark of willow, which adhere together, and feparate from each other alter- 

 nately with horizontal apertures between them ; which are believed to be air-veffels, 

 for the' purpofe of oxygenating the blood of the embryon buds, like the air-bag at the 

 broad end of an egg. ^ ^ ^ are the longitudinal filaments of the bark, aaa^xt the ho- 

 rizontal perforations. 



D 



of oak • the fmaller ones he believed to be the excretory duds of the perfpirable matter, 

 and larger ones I fuppofe to be air-veffels. The extremities of fome of thefe in the birch- 

 tree flood above the level of the cuticle. Phyfique des Arbres, Plate I, Fig. 7. and 1 1. 

 See Sea. I. 7. and II. 4. of this work. 



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