( m ) 
Mountain- Ash, thus engrafted betwixt the 
branches of an Apple-tree, is now growing in 
my garden, and continues yearly to increafe 
in fize and vigour, exhibiting a ftriking con- 
trail: to the old decaying tree by which it is 
fupported. It is not exactly known in what 
manner fuch trees receive their nourishment ; 
probably they become parafite plants, and de- 
rive their food from the juices of the tree to 
which they are attached, or, perhaps, live 
chiefly on the air, as thofe trees muffc necef- 
farily do, which grow in the fiflures of rocks 
or walls, where there is not earth iuffi- 
cient for their fuftenance. Laftly, feeds are 
perfed by an elaftic force in the feed-veffel, 
or in fome part belonging to the feed. Stipa 
(feather grafs), as it's feeds arrive at maturity ? 
diflodges them, by twifting the bafe of the 
long feather by which they are crowned, till 
it detaches the feed from it's receptacle, and 
carries it to a confiderable diftance from the 
plant : thus are the feeds of Geranium and 
Oat difperfed by the twifting of the Awns 
which crown them. 
The Receptacle is the laft part of fructifi- 
cation that is to be confidered, by which 
all the other parts of fructification are con- 
C 3 nected, 
