ClipArt ETC
1, Epyornis; 2, Ostrich; 3, Cassoway; 4, Wild Goose; 5, hen; 6, Pigeon; 7, Humming-bird; 8, Eagle; 9, Vulture; 10, Penguin; 11, Crocodile; 12, Python; 13, Fresh-water Tortoise; 14, Boa of St. Lucia; 15, Tortoise; 16, Ophidan; 17, Dog-fish; 18, Ray-fish. The figure in the background without a number represents the egg of the Moa (extinct).

Comparative view of the size of the eggs of different animals

1, Epyornis; 2, Ostrich; 3, Cassoway; 4, Wild Goose; 5, hen; 6, Pigeon; 7, Humming-bird; 8, Eagle; 9,…

"The elliptical circle being supposed to be the Earth's orbit, with the Sun, S, in one of the foci. Now the spaces, 1, 2, 3, etc., though of different shapes, are of the same dimensions, or contain the same quantity of surface. The Earth, we have already seen, in its journey round the Sun, describes an ellipse, and moves more rapidly in one part of its orbit than in another. But whatever may be its actual velocity, its comparative motion is through equal areas in equal times. Thus its center passes from E to C, and from C to A, in the same period of time, and so of all the other divisions marked in the figure." —Comstock, 1850

Elliptical Orbit

"The elliptical circle being supposed to be the Earth's orbit, with the Sun, S, in one of the foci.…

"Wire-gage, a gage for measuring the thickness of wire and sheet-metal. It is usually a plate of steel having round the edge a series of notches of standard opening." -Whitney, 1911

Wire Gauge

"Wire-gage, a gage for measuring the thickness of wire and sheet-metal. It is usually a plate of steel…

"Outline of the Kangaroo about twelve hours after birth, showing its natural size and external development in this period." — Chambers, 1881

Infant Kangaroo

"Outline of the Kangaroo about twelve hours after birth, showing its natural size and external development…

"Circular Motion of the Planets." —Comstock, 1850

Planet Motion

"Circular Motion of the Planets." —Comstock, 1850

"Elliptical Orbits.—It has been supposed that the Sun's attraction, which constitutes the Earth's gravity, was at all times equal, or that the Earth was at an equal distance from the Sun, in all parts of its orbit." —Comstock, 1850

Planet Motion

"Elliptical Orbits.—It has been supposed that the Sun's attraction, which constitutes the Earth's…

"The comparative dimensions of the planets." —Comstock, 1850

Planet Sizes

"The comparative dimensions of the planets." —Comstock, 1850