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A longitudinal section of an acorn, showing two cotyledons and the embryo.

Longitudinal section of an acorn

A longitudinal section of an acorn, showing two cotyledons and the embryo.

"Showing (1) cartilage with martrix and cells; (2) cartilage with matrix containing cells and white fibers." — Blaisedell, 1904

Longitudinal section of cartilage

"Showing (1) cartilage with martrix and cells; (2) cartilage with matrix containing cells and white…

"Cascade Furnace—Longitudinal Section." — The Encyclopedia Britannica, 1893

Cascade Furnace

"Cascade Furnace—Longitudinal Section." — The Encyclopedia Britannica, 1893

"Longitudinal tangential section of [maple], showing the ends of the medullary rays." - Century, 1889

Longitudinal Tangential Section of Maple

"Longitudinal tangential section of [maple], showing the ends of the medullary rays." - Century, 1889

A longitudinal section of an oat seed.

Cross-section of an oat seed

A longitudinal section of an oat seed.

"An apparatus devised by Mach for the illustration of the pendular motions of the particles of a medium transmitting waves of any kind, longitudinal or transverse, stationary or progressive." — Avery, 1895

Line of pendulums

"An apparatus devised by Mach for the illustration of the pendular motions of the particles of a medium…

"Radial longitudinal section of wood of Pinus Sylvestris. a, cambium; b, c, d, e, f, wood cells; f, bordered pits in an early stage of formation, before the thickening ring has arched over the thin portion of cell'wall; t', bordered pit after the thickening mass has arched over the thin cell-wall; st, very large pits where in contact with medullary rays." — Encyclopedia Britanica, 1893

Pinus Sylvestris

"Radial longitudinal section of wood of Pinus Sylvestris. a, cambium; b, c, d, e, f, wood cells; f,…

"1, longitudinal section; 2, 3, 4, cross section; 5, detached disk; 7, 8, fibrillae." — Richardson, 1906

Striped Muscle

"1, longitudinal section; 2, 3, 4, cross section; 5, detached disk; 7, 8, fibrillae." — Richardson,…

"Longitudinal section of valves. A, ventral, B, dorsal valves; l, loop; q, crura; ss, septum; c, cardinal process." — Encyclopedia Britanica, 1893

Valves

"Longitudinal section of valves. A, ventral, B, dorsal valves; l, loop; q, crura; ss, septum; c, cardinal…

"<em>A</em>, part of a vein laid open, with two pairs of valves; <em>B</em>, longitudinal section of a vein, showing the valves closed." &mdash; Blaisedell, 1904

Vein

"A, part of a vein laid open, with two pairs of valves; B, longitudinal section of…

A longitudinal section of of smutted wheat.

Smutted wheat

A longitudinal section of of smutted wheat.