U.8. 



ubi 



IS 



<• 



inter 



« 



» and 

 ^ eafy 



bel 



in 



ion of 



orU 

 :1s be- 



1 luch 



nged; 



honey 



buds, 

 :ig the 

 urifhes 



of the 



inually 



elr fo- 

 branch 



lofe its 



and an 



Is are a 



part 

 veffels 



which) 



» 



foriunfi 

 It whe- 

 cal ah- 

 . a very 



Sect. III. II. 9. 



UMBILICAL VESSELS. 



^ 



:> 



7 



fmall portion of brain in the head compared with that in the fpine of 

 the back, as in eels, fnakes, worn:is, butterflies, if the head be cut off, 

 the other parts will continue to live with great adivity for hours, and 



days ; fo it happen 



fe umbilical abforbent veffels, w 



/ 



in vine-ftumps, and many herbaceous plants, will continue to pour 

 out the fap-juice in great force and great quantity for many days af- 

 ter the exiedtion of the whole upper part of the plant. 



The continuance of the motion of thefe umbilical vefTels confiding 

 of a fpiral Hne, which are believed to be air-veflels by many authors, 

 is mentioned by Malpighi ; who aflerts, that when he examined them 

 in the winter, he could often obferve them for fome time to continue 

 their vermicular motion fo as to aftonifh him. See Duhamel. Phyf. 



des arb. Vol. I. p. 43. 



9. The umbilical vefTels of this fedion, 1 



I 



ke the abforbents of th 



preced 



both which are believed to confift of a fp 



fhewn in Se<5t. II. 7. may be readily feen. in cutting a vine-ftalk ho- 

 rizontally, as they at firft appear full of fluid ; but in a very little time, 

 as the fluid exhales or becomes efFufed, a circular area of round holes 

 appears to pafs longitudinally interior in refpe6l to the bark ; which I 

 fuppofe to confift both of the umbilical vefTels, which bleed during the 

 vernal months, and of the other radical, cellular, and cutaneous ab- 

 forbents; the latter of which I fufpeft to be exterior to the former, 

 and to refide between the bark and the umbilical vclTels, though both 

 of them are believed to conftitute the alburnum of the plant. 



From many 



obfervatlons on vegetabl 



monfieur d 



BaifTe draws the following conclufions, which are alTented to by M. 

 Bonnet, and which I fhall here tranfcrlbe, as they fo accurately co- 



hey were deduced 



He fays. 



d 



jncide with the theory above delivered 

 from different experiments, are a cor 

 ** that the vefTels deftined to convey nourifhment 



firmatlon of It. 



are nei- 



the pith, nor in the bark, nor between the bark and the wood 



bu^ 



f- 



