ich in its dried state is introduced into a
canal and dilates the canal as it expands by the absorption of moisture.

SEBACEOUS GLANDS. The oil-tubes of the skin. Illus. page 71.

SECRETION. The process by which substances are separated from the blood.

SEDATIVES. Medicines which allay irritation or irritability of the
nervous system.

SEDENTARY. Requiring much sitting.

SELF-POLLUTION. See SELF-ABUSE.

SEMEN. The secretion of the testicles which is thrown out during sexual
intercourse and contains the principle of generation.

SEMI-FLUID. Half fluid.

SEMILUNAR VALVES. Valves in the heart. See 9 and 17, Fig. 41, page 58.

SEMINAL VESICLES. Reservoirs for the sperm. See Seminal Sac, on page
207.

SEPTIC. That which corrodes or produces putrefaction.

SEPTICAEMIA. Blood-poisoning; usually by absorption.

SEQUEL. That which follows; the condition or malady which follows a
disease.

SEROUS. Watery. Pertaining to the serous membrane.

SEROUS TISSUE. The membranes lining the closed cavities of the body,
which secrete a watery, lubricating fluid.

SHOCK. Sudden depression of vitality occasioned by injury.

SITZ BATH. See page 367.

SLOUGHING. The process of separating a mortified part from a healthy
part, through the agency of pus.

SMELL, NERVES OF. Illus. page 111.

SOLAR PLEXUS. Described on page 104.

SOLVENTS. Those chemicals which break up or dissolve substances.

SORDES. Foul accumulation on the teeth, noticed in fevers.

SOUND. An instrument for exploring cavities or canals for diagnosis or
treatment.

SPECIALTY. That to which special attention is given.

SPECIFIC GRAVITY. Comparative weight; as between urine and water.

SPECULUM. An instrument for examining cavities. Illus. pages 717 and
718.

SPERM. See SEMEN.

SPERMATIC CORD. The mass of arteries, veins, nerves, absorbents and
their coverings, which passes along the groin and over the pubic bone,
to the testicle.

SPERMATORRHEA. Described on page 772.

SPERMATOZOA. More than one Spermatozooen.

SPERMATOZOON. Defined on page 12; Illus. page 13.

SPHINCTERS. Bound muscles which close natural openings.

SPHYGMOGRAPH. An instrument for examining the heart. Illus. page 548.

SPICULA. A small pointed piece of bone.

SPINAL COLUMN. The twenty-four bones, which, situated one above the
other, form the backbone.

SPINAL CORD. Described on page 90.

SPIROMETER. A gauge of chest capacity. Illus. page 392.

SPONGE TENT. Compresse