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"Sense-epithelium cell of Aurelia." — Encyclopedia Britannica, 1893

Epithelium

"Sense-epithelium cell of Aurelia." — Encyclopedia Britannica, 1893

"Portion of epithelium from the tentacle of an Actinian, showing three supporting cells and one sense cell (sc); 2, a enidoblast with enclosed nematocyst from the same specimens; 3 and 3, two forms of gland cell from the stomodaeum; 5a and 5b, epithelio-muscular cells from the tentacle in different states of contraction; 5c, an epithelio-muscular cell from the endoderm, containing a symbiotic zooxanthelia; 6, a ganglion cell from the ectoderm of the peristome." — The Encyclopedia Britannica, 1910

Epithelium

"Portion of epithelium from the tentacle of an Actinian, showing three supporting cells and one sense…

"<em>A</em>, pinna; <em>B</em>, cavity of the concha, showing the openings of a great number of sebaceous glands; <em>C</em>, external auditory meatus; <em>D</em>, typanic membrane; <em>F</em>, incus; <em>H</em>, malleus; <em>K</em>, handle of malleus applied to the internal surface of the membrana typani; <em>L</em>, tensor typani muscle; between <em>M</em> and <em>K</em> is the tymphanic cavity; <em>N</em> Eustachian tube; <em>O,P,</em> semicircular canals; <em>R</em>, internal auditory canal; <em>S</em>, large nerve given off from the facial nerve; <em>T</em>, facial and auditory nerves." &mdash; Blaisedell, 1904

General view of organ of hearing

"A, pinna; B, cavity of the concha, showing the openings of a great number of sebaceous…

The sense of smell is closely allied with the sense of taste. The organs of the sense of smell are simple nerve-endings in papillae or pits. The substance to be smelled must come to the organs of smell as a gas or vapor. This example shows the smelling pits on the expanded terminal segments on the antenna of a leaf-eating beetle.

Sense of Smell

The sense of smell is closely allied with the sense of taste. The organs of the sense of smell are simple…

The sense of taste enables us to test in some degree the chemical constitution of substances we take into the mouth as food. These organs are located in the mouth or on the mouth parts. This example shows a vertical section of large papilla on the tongue of a calf detailing the taste buds

Sense of Taste

The sense of taste enables us to test in some degree the chemical constitution of substances we take…

An example of how to produce a tone. This illustration shows one end of a string fixed to a hook and suspending a weight from the other end. When you pluck the string it causes it to make a musical note, also known as a tone.

Tone

An example of how to produce a tone. This illustration shows one end of a string fixed to a hook and…

"A glass bell is fixed to stand, and beside it is a stand carrying a small ivory ball. This is so arranged that the ball shall just rest against the rim of the glass, Now let the violin bow be rubbed with a lump of rosin, and then drawn steadily over the edge of the glass. A clear musical note will be produced, but the vibrations of the glass will scarcely be perceptible to the eye." -New, 1891

Tone

"A glass bell is fixed to stand, and beside it is a stand carrying a small ivory ball. This is so arranged…

"If a light strip of steel is firmly gripped at one end in a vice and the other end plucked aside, it will, when let go, vibrate backwards and forwards as shown; and if the vibrations are sufficiently rapid, a musical note will be produced." -New, 1891

Tone

"If a light strip of steel is firmly gripped at one end in a vice and the other end plucked aside, it…