ught to view by the removal of a
section of the lower jaw.]

238. The PAROTID GLAND, the largest, is situated in front of the
external ear, and behind the angle of the jaw. A duct (Steno's) from
this gland opens into the mouth, opposite the second molar tooth of
the upper jaw.

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237. How many glands about the mouth? Give their names. What does fig.
58 represent? 238. Describe the parotid gland.

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239. The SUBMAXILLARY GLAND is situated within the lower jaw, anterior
to its angle. Its excretory duct (Wharton's) opens into the mouth by
the side of the _frae'num lin'guae_, (bridle of the tongue.)

240. The _SUBLINGUAL GLAND_ is elongated and flattened, and situated
beneath the mucous membrane of the floor of the mouth, on each side of
the fraenum linguae. It has seven or eight small ducts, which open into
the mouth by the side of the bridle of the tongue.

_Observation._ In the "mumps," the parotid gland is diseased. The
swelling under the tongue called the "frog" is a disease of the
sublingual gland.

[Illustration: Fig. 59. A side view of the face, oesophagus, and trachea.
1, The trachea (wind pipe.) 2, The larynx. 3, The oesophagus. 4, 4, 4,
The muscles of the upper portion of the oesophagus forming the pharynx.
5, The muscle of the cheek. 6, The muscle that surrounds, the mouth. 7,
The muscle that forms the floor of the mouth.]

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239. The submaxillary. 240. The sublingual. What observation
respecting these glands? What does fig. 59 represent?

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241. The PHARYNX is a membranous sac, situated upon the upper portion
of the spinal column. It extends from the base of the skull to the top
of the _tra'che-a_, (windpipe,) and is continuous with the oesophagus.
From the pharynx are four passages; one opens upward and forward to
the nose, the second leads forward to the mouth, the third downward to
the trachea and lungs, the fourth downward and backward to the
stomach.

242. The OESOPHAGUS is a large membranous tube that extends behind the
trachea, the heart, and lungs, pierces the diaphragm, and terminates
in the stomach. It is composed of two membranes--an internal, or
mucous, and a muscular coat. The latter is composed of two sets of
fibres; one extends lengthwise, the other is arranged in circular
bands.

243. The STOMACH is situated in the left side of the abdomen,
immediately below and in contact