^^\ 



r. 



ofth 



etii 



ere 



It 



le 



^lood 



^e blood 

 ^0 th^ 



]S 



rami- 



ind 



nu 



on, and 



• may be 

 -ye, and 

 lood has 

 :her fyf- 



r for the 

 3ns, ex- 

 is again 

 1 in the 



he blood 

 fluence 



n 



or 



fewer 



leaf 0^ a 



of a 



tioii 



;he livers 



of arte- 



he roots 



^ the va- 



> 



ma 



dder 



? 



:rp 



etiiaHy 



Sect. V. i 



AND VEINS. 



59 



P 



no more than their perpetual wafte may require, I formerly be 

 ved, that this refervoir, or venous fyftem, was not neceilary iu vege 

 tables ; and that therefore probably it did not exift. I was induced b 

 adopt this idea from having obferved in cutting afunder a ilem of larg 



f- 



fp 



phorbia heliofcop 



hich the rifing fap could 



miftaken for the milky blood ; that much more of the vegetable blood 

 flowed from the upper part of the plant than from the lower part of 



it 



d I therefore fufpeded, that there was no returning 



But firfl this muft 



refpondent to the defcending aortal arteries. 



ceffarily occur from the veins returning from the root effufing th 



blood flower than the arteries of the upper part of th 



plant 



fecondly, if there were no returning veins from the lower 



, And 

 part of 



the plant, there ought to have been no eiFufion of blood from it. I 

 have fince obferved on cutting afunder a large plant of picris, and alfo 

 a large plant of tragopogon fcorzonera, and inftantly infpefting them 



with a com 



lens ; that 



fible, which oozed a milky j 



divifion of th 



plan 



concentric circles of vefTels were 

 uice ; the internal circle of the upper 

 d the external one of the lower divi- 



fion, appeared to bleed more copioufly, and in quicker ftrpams, than 

 the external circle of the upper divifion, and the internal one of the 

 lower divifion : whence I concluded, that the veffels of the internal 



were 



d thofe of th 



and th 



the arteries of the upper part of the plant, which arife from the up 

 per part of the caudex of each individual bud, were thus feen to pou 

 out more blood, and in a quicker flream, than the veins of the lowe 

 part ef the plant, as they return from th 



Add to this, that as the pulmonary arteries in the green leaves'of 

 plants, and in their petals, have correfpondent veins vifible to the eye; 

 and that thele are alfo feen in the calyxes of fome flowers, which 

 from their other evident ufes can not be efteemed pulmonary organs : 

 There is the ftrideft analogy to believe, that the aortal arteries of the 



■feai-k of the trunk and roots have alfo their correfpondent veins. 



I 



Neverthclefs 



