248 Of the Wood of Roots . 
°f them are alfo arched thereabout. In all, or many 
trefoils, and of the leguminous kind, only one third of 
the bark. In the umbelliferous, they are fituate between 
the diametrical portions of the parenchyma. In the mi- 
crofcope they all of them appear to be real circles; and 
in a tranfverfe fe&ion, when the milk has been licked off 
with the tongue, till no more will rife. They may 
alfo be foalced in water, after which the pofition of the 
milk vefiels will be vifibie ; in fome roots they run more 
parallel and keep afunder, as in monks-hood, and join to¬ 
wards the circumference of the bark, in eryngo. They 
terminate more circular, in briony angular, or in the 
form of a glory, as will appear alfo on viewing an 
horfe-raddifh root, C D E F G H I, fig. 473. in the mi- 
crofcope. In fome almoft entire circles, as in dandelion ; 
in others compofed of fhort chords; in fome thefe fpecks 
are fo exceeding fmall, that to the naked eye they feem 
continued rings, but when viewed in the microfcope, are 
diftindl vefiels, as in marfh-mallows, and liquorice. In 
marfh-mallows the lymphaedudts appear in rays, and the 
la&eals in rings, fig. 469. In dandelion they appear to 
the naked eye like numerous rings, but when viewed 
through the microfcope, are found to ccnfift of very many 
fmall rays, ftreaming from the inner verge of the bark, 
a-crofs three or four of the fmaller rings. 
Of the wood of roots. 
T HAT portion of the root, which is contiguous to, 
and within the bark; in trees, and fhrubby plants, 
is the wood, which confifts of the parenchyma and lig- 
nous fubftance. The firfi: of which is of the fame na¬ 
ture with that of the bark. The pofition of its feveral 
parts are mofily diametrical, running between the lignous 
parts. 
