.= Internal checking.

=Honeycombing.= Internal checking.

=Hot-blast kiln.= A drying arrangement in which the air is blown
through heating coils into the drying room.

=Humidity.= Damp, moist.

=Hygroscopicity.= The property of readily imbibing moisture from
the atmosphere.

=Indefinite.= Applied to petals or other organs when too numerous
to be conveniently counted.

=Indigenous.= Native to the country.

=Involute.= A form of vernation in which the leaf is rolled inward
from its edges.

=Kiln-drying.= Drying or seasoning of wood by artificial heat in an
inclosed room.

=Leaflet.= A single division of a compound leaf.

=Limb.= The spreading portion of the tree.

=Lumen.= Internal space in the spring- and summer-wood fibres.

=Median.= Situated in the middle.

=Medulla.= The pith.

=Medullary rays.= Rays of fundamental tissue which connect the
pith with the bark.

=Membranous.= Thin and rather soft, more or less translucent.

=Midrib.= The central or main rib of a leaf.

=Moist-air kiln.= A drying arrangement in which the heat is taken
from radiating coils located inside the drying room.

=Mottle.= Figure transverse of the fibres, probably caused by the
action of wind upon the tree.

=Non-porous.= Without pores.

=Oblong.= Considerably longer than broad, with flowing outline.

=Obtuse.= Blunt, rounded.

=Oval.= Broadly elliptical.

=Ovary.= The part of the pistil that contains the ovules.

=Parted.= Cleft nearly, but not quite to the base or midrib.

=Parenchyma.= Short cells constituting the pith and pulp of the
tree.

=Pericarp.= The walls of the ripened ovary, the part of the fruit
that encloses the seeds.

=Permeable.= Capable of being penetrated.

=Petal.= One of the leaves of the corolla.

=Pinholes.= Small holes in the wood caused by worms or insects.

=Pistil.= The modified leaf or leaves which bear the ovules; usually
consisting of ovary, style and stigma.

=Plastic.= Elastic, easily bent.

=Pocket kilns.= Small drying rooms with openings on one end only
and in which the material to be dried is piled directly on the
floor.

=Pollen.= The fertilizing powder produced by the anther.

=Pores.= Minute orifices in wood.

=Porous.= Containing pores.

=Preliminary steaming.= Subjecting wood to a steaming process
before drying or seasoning.

=Progressive kiln.= A drying arrangement with openings at both
ends, and in which the material enters at one end an