SPECIALISATION.--The setting apart of a particular organ for the
performance of a particular function.
SPINAL CORD.--The central portion of the nervous system in the Vertebrata,
which descends from the brain through the arches of the vertebrae, and
gives off nearly all the nerves to the various organs of the body.
STAMENS.--The male organs of flowering plants, standing in a circle within
the petals. They usually consist of a filament and an anther, the anther
being the essential part in which the pollen, or fecundating dust, is
formed.
STERNUM.--The breast-bone.
STIGMA.--The apical portion of the pistil in flowering plants.
STIPULES.--Small leafy organs placed at the base of the footstalks of the
leaves in many plants.
STYLE.--The middle portion of the perfect pistil, which rises like a column
from the ovary and supports the stigma at its summit.
SUBCUTANEOUS.--Situated beneath the skin.
SUCTORIAL.--Adapted for sucking.
SUTURES (in the skull).--The lines of junction of the bones of which the
skull is composed.
TARSUS (pl. TARSI).--The jointed feet of articulate animals, such as
insects.
TELEOSTEAN FISHES.--Fishes of the kind familiar to us in the present day,
having the skeleton usually completely ossified and the scales horny.
TENTACULA or TENTACLES.--Delicate fleshy organs of prehension or touch
possessed by many of the lower animals.
TERTIARY.
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