76 VEGETABLE STJIUCTURE, 
equal freedom from one Veffel to another throughout tlie whole fuhflance : 
but between the cuter and the inner Bark, the communication is altoge- 
ther different: part of the Juices from the ^'efTels of the outer Bark ap- 
pear, inieed, to be received into the VefTels of the inner Rind ; but it is 
after extravafat.on ; and after an alteration plainly made in the Glands, 
which difeharge them ; probably alfo, after another made in the glandular 
mouths, by which they are received. 
Another part of Nature’s operation in perfecting the Sap, appears alfo 
very evidently and very fingularly in the conftruCtion of this inner Rind. 
Befide the Membranes which inclofe thefe VefTels, there is a fpungy fub- 
itance between them : the fame VefTels' alfo have Glands for difeharging, 
and mouths probably glandular alfo, for receiving fluids ; and this in parts 
where no Juice can be received by the one, but what has .been firft dif- 
charged by the other. This is evidently the cafe of the middle Couches of 
this Rind. It feems, tlierefore, that part of the Juices of thefe VefTels is 
difeharged thro’ the prominent Glands, into the interftice between the two 
Membranes, and there received by the fpungy fubfliance before deferibed, 
in which it fuffers fome change, and is then received by the hollowed or 
deprefTed mouths of the fame VefTels into them again. However this be, 
the conflruClion of the parts is evident, and we fee what is the connection 
of the outer and inner Rinds of Plants. 
Pursuing this fubjeCl as the former, thro’ other Inflances, we find that 
in the Polyanthus the inner Rind is conflruCted exaCtly as in Hellebore, 
only the VefTels are more diflant, and in fome places divide into two, in 
their afeent. In the inner Rind of the Anemone, the VefTels are placed 
yet more diflant, and run quite flrait. In both thefe the two kinds of 
glandular mouths, the prominent and the deprefTed, are placed as in the 
Hellebore ; only in the Polyanthus they are very minute, and thick fet ; 
but in the Anemone, on the contrary, they are much larger, and more 
diflant. In the Hyacinth the oblique bars are larger and more numerous, 
but otherwife the conftruCtion is entirely the ftme ; the Juices of this Plant 
being thick, it is difficult to get the parts perfectly clear of one another ; 
but the Glands are feen to more advantage. 
In the NarcifTus the Crofs-bars run lefs obliquely; the afeending Vef- 
fels fwell between joint and joint, and the Glands of both kinds ape nu- 
merous, but minute, and are fituated only on the fwelled part. We fee 
by thefe examples, that altho’ the difpofition of the VefTels of this Rind 
varies a little, their conftruCtion is the fame ; and we* thus know what is 
the flruCture of this fecond of the conftituent parts of every Plant. All 
