grew with a leaden plate. Next morning the drop appeared upon it as
before--_Richard._

One of the hydrangea tribe perspires so freely, that the leaves wither and
become crisp in a very short space of time, if the plant be not amply
supplied with water: it has 160,000 apertures on every inch square of
surface, on the under disk of the leaf.

_Why is more or less of a gummy, resinous, or saccharine matter found in
every tree?_

Because it is formed by branches of those returning vessels that deposit
the new alburnum.

_Why is it inferred that these juices must be prepared in the plant itself,
by various secretions, and changes of the fluids which it absorbs?_

Because we find, that in the same climate, nay, even in the same spot of
ground, rue has its bitter--sorrel its acid--and the lettuce its cooling
juices; and that the juices of the various parts of one plant, or even of
one fruit, are extremely different. Sir James Smith mentions the
peach-tree as a familiar example. "The gum of this tree is mild and
mucilaginous. The bark, leaves, and flowers, abound with a bitter
secretion, of a purgative and rather dangerous quality, than which nothing
can be more distinct from the gum. The fruit is replete, not only with
acid, mucilage, and sugar, but with its own peculiar aromatic and highly
volatile secretion, elaborated within itself, on which its fine flavour
depends."--_Introduction to Botany, 6th edit_.

_Why are these juices readily found in the bark?_