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"Upper Sectorial Teeth of Carnivora. I, Felis; II, Canis; III, Ursus, 1, anterior, 2, middle, and 3, posterior in position, and without distinct root, characteristic of the Ursidae." —The Encyclopedia Britannica, 1903

Carnivora

"Upper Sectorial Teeth of Carnivora. I, Felis; II, Canis; III, Ursus, 1, anterior, 2, middle, and 3,…

"When two bodies of equal weight are connected by a rod, the centre of gravity will lie in the middle of that rod. When two bodies of unequal weight are so connected, the centre of gravity will be nearer to the heavier one. These principles are illustrated [here], in which C represents the centre of gravity." —Quackenbos 1859

Center of Gravity of Rod with Weights

"When two bodies of equal weight are connected by a rod, the centre of gravity will lie in the middle…

"Diagram of the Middle and Internal Ear." — Blaisedell, 1904

Ear

"Diagram of the Middle and Internal Ear." — Blaisedell, 1904

"FESS POINT. The exact centre of the escutcheon, as seen in the annexed example." -Hall, 1862

Fess Point

"FESS POINT. The exact centre of the escutcheon, as seen in the annexed example." -Hall, 1862

The central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes

Wheel Hub

The central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes

A man with birds, from the Middle Ages.

Man with birds

A man with birds, from the Middle Ages.

"Lightly touch the wire at its middle point with the tip of the finger or the beard of a quill; the wire will vibrate in halves." -Avery 1895

Sound Wave

"Lightly touch the wire at its middle point with the tip of the finger or the beard of a quill; the…

Illustration of a triangle with the median drawn.

Triangle With Median Drawn

Illustration of a triangle with the median drawn.

Illustration to show that if the lines joining the middle points of the sides of a triangle divide the triangle into four equal triangles.

Midpoints of Triangle Divide Triangle into Four Equal Triangles

Illustration to show that if the lines joining the middle points of the sides of a triangle divide the…

Illustration of a triangle with a segment parallel to the base.

Triangle With Parallel Segment Drawn

Illustration of a triangle with a segment parallel to the base.

Illustration of a right triangle with the midpoint of the hypotenuse drawn.

Right Triangle With Midpoint of Hypotenuse Drawn

Illustration of a right triangle with the midpoint of the hypotenuse drawn.

Found in Southern Europe, the middle spotted woodpecker has a black coat, with a crimson underside and a red spot on its head.

Middle Spotted Woodpecker

Found in Southern Europe, the middle spotted woodpecker has a black coat, with a crimson underside and…