"Diagram showing the capillary network of the air sacs and origin of the pulmonary veins.. <em>A</em>, small branch of pulmonary artery; <em>B</em>, twigs of pulmonary artery; <em>C</em>, capillary network around the walls of the air sacs; <em>D</em>, branches of network converging to form the veinlets of the pulmonary veins." — Blaisedell, 1904

Capillaries of the Air Sac

"Diagram showing the capillary network of the air sacs and origin of the pulmonary veins.. A,…

"<em>A</em>, epithelial lining wall; <em>B</em>, partition between two adjacent sacs, in which run capillaries; <em>C</em>, fibers of elastic tissues." &mdash; Blaisedell, 1904

Diagrammatic view of an air sac

"A, epithelial lining wall; B, partition between two adjacent sacs, in which run capillaries;…

"This was invented in 1865 by H. Sprengel. The instrument, in its original (simplest) form, consists of a vertical capillary glass tube a of about 1 mm. bore, provided with a lateral branch b near its upper end, which latter, by an india-rubber join governable by a screw-clamp, communicates with a funnel. The lower end is bent into the shape of a hook, and dips into a pneumatic trough. The vessel to be exhausted is attached to b, and, in order to extract its gas contents, a properly regulated stream of mercury is allowed to fall through the vertical tube." &mdash;The Encyclopedia Britannica, 1903

Air-Pump

"This was invented in 1865 by H. Sprengel. The instrument, in its original (simplest) form, consists…

Relations of the artery, vein, and capillaries.

Relations of Artery, Vein, and Capillaries

Relations of the artery, vein, and capillaries.

"Showing how the circulation of blood in the web of a frog's foot looks as seen under the microscope." &mdash; Blaisedell, 1904

Circulation of blood

"Showing how the circulation of blood in the web of a frog's foot looks as seen under the microscope."…

"Blood plasma passing out of capillary to feed the body cells." &mdash;Davison, 1910

Capillaries

"Blood plasma passing out of capillary to feed the body cells." —Davison, 1910

Capillaries. 1: Vein; 2: Artery; 3: Capillary.

Capillaries

Capillaries. 1: Vein; 2: Artery; 3: Capillary.

Capillaries (C) in the web of the frog's foot connecting a small artery (A) with a small vein (V).

Capillaries in Frog's Foot

Capillaries (C) in the web of the frog's foot connecting a small artery (A) with a small vein (V).

A large capillary from the frog's mesentery eight hours after irritation had been set up, showing emigration of leucocytes. Labels: a, Cells in the act of traversing the capillary wall; b, some already escaped.

Capillaries Showing Emigration of Leucocytes

A large capillary from the frog's mesentery eight hours after irritation had been set up, showing emigration…

The walls of capillaries are composed of a single layer of elongated or radiate, flattened and nucleated cells, so joined and dovetailed together as to form a continuous transparent membrane.

Capillaries Showing Nucleated Endothelial Membrane

The walls of capillaries are composed of a single layer of elongated or radiate, flattened and nucleated…

Diagrammatic representation of a capillary seen from above and in section. Labels: a, the wall of the capillary with, b, the nuclei; c, nuclei belonging to the connective tissue in which the capillary is supposed to be lying; d, the canal of the capillary.

Diagram of a Capillary

Diagrammatic representation of a capillary seen from above and in section. Labels: a, the wall of the…

"b is a glass tube in water and c is a glass tube in mercury. The surface of the water in the tube b is concave, while the surface of the mercury in the tube c is convex." &mdash; Hallock, 1905

Capillary Attraction

"b is a glass tube in water and c is a glass tube in mercury. The surface of the water in the tube b…

Isolated capillary network formed by the junction of several hallowed-out cells, and containing colored blood-corpuscles in a clear fluid. Labels: p, p, pointed cell-processes extending in different directions for union with neighboring capillaries.

Capillary Network

Isolated capillary network formed by the junction of several hallowed-out cells, and containing colored…

The capillary network of the pulmonary blood vessels in the human lung.

Capillary Network in Lung

The capillary network of the pulmonary blood vessels in the human lung.

The liver is made up of small roundish or oval portions called lobules, each of which is composed of minute branches of the portal vein, hepatic artery, hepatic duct, and hepatic vein. Shown is the capillary network of the lobules of the rabbit's liver. The figure is taken from a very successful injection of the hepatic veins showing nearly the whole of two lobules, and parts of three others. Labels: p, portal branches running in the interlobular spaces; h, hepatic veins penetrating and radiating from the center of the lobules.

Capillary Network in the Lobules of a Rabbit's Liver

The liver is made up of small roundish or oval portions called lobules, each of which is composed of…

The form of the capillary network presents considerable variety in the different textures of the body: the varieties consists principally of modifications of two chief kind of mesh, the rounded and the elongated. The kind in which the meshes or interspaces have a roundish form is the most common, and prevails in those parts which the capillary network is most dense, such as the lungs. Shown is the network of capillary vessels of the air cells of the horse's lung magnified. Labels: a, capillaries proceeding from b, terminal branched of the pulmonary artery.

Capillary Vessels of Air Cells

The form of the capillary network presents considerable variety in the different textures of the body:…

"Among the cells of the body there is, besides the blood capillaries, a system of fine, thin-walled lymphatic capillaries." &mdash; Ritchie, 1918

Lymphatic vessels in the fingers

"Among the cells of the body there is, besides the blood capillaries, a system of fine, thin-walled…

"Showing Furrow Method of Irrigating Potatoes. The arrows indicate the direction taken by the capillary water."&mdash;The Federal Digest, 1921

Furrow Method

"Showing Furrow Method of Irrigating Potatoes. The arrows indicate the direction taken by the capillary…

"<em>A</em>, an air sac; <em>B</em>, an air sac cut open; <em>C</em>, capillary network over an air sac; <em>D</em>, branch of pulmonary artery; <em>E</em>, branch of pulmonary vein; <em>F</em>, bronchial tube." &mdash; Blaisedell, 1904

Lobule of the lung

"A, an air sac; B, an air sac cut open; C, capillary network over an air…

"Ideal section, greatly enlarged, showing minute capillary circulations." &mdash;Brown, 1884

Villus

"Ideal section, greatly enlarged, showing minute capillary circulations." —Brown, 1884