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These it receives from the red arterial blood. The cells must also be provided with an outlet for their waste products. This is furnished by the venous circulation, which represents the drainage system of the body.
Next it seems as if the strongly contracted arterioles begin actually to prevent some of the peripheral circulation, the blood is piled up in the large arteries, and the venous circulation becomes more and more sluggish, while the lips, finger nails and forehead become cyanotic.
If the blood be welling up from the wound and of a dark red colour it is venous blood, if it spurt up from the wound and be of a bright red colour it is arterial blood. What has to be done is to place a pressure on the vein or artery to prevent the blood escaping. Venous bleeding may generally be stopped by putting a pad of lint dipped in cold water on the wound and tying it on with a bandage.
These tubes are hollow, like a pipe-stem, and their inner surface consists of wonderfully minute capillaries filled with the impure venous blood. And in these small tubes the same process is going on as takes places when the carbonic acid and water of the blood are exhaled from the lungs.
This is what takes place: The morbid matter and poisons thrown off by the cells and tissues are carried by means of the venous circulation to the organs of elimination, the bowels, kidneys, lungs and skin, and to the mucous membranes lining the interior tracts, such as the nasal passages, the throat and bronchi, the digestive and genitourinary canals, etc.
In the Dipneusts the auricle of the heart is divided by an incomplete partition into two halves. Only the right auricle now receives the venous blood from the veins of the body. The left auricle receives the arterial blood from the pulmonary veins.
On reaching this extreme point of its course, the blood passes into equally minute ramifications of the veins, which in their turn gradually coalesce, and form larger and larger trunks, till they at last terminate in two large veins, by which the whole current of the venous blood is brought back in a direction contrary to that of the blood in the arteries, and poured into the right side of the heart.
I could readily imagine that Selim, cunning but thoughtless, caressing yet unfeeling, had played with the little girl, torn off her ear-rings, killed her, and hidden her body. The affair soon passed out of my mind. The epidemic was spreading from Old Cairo to the European quarters. I was visiting from thirty to forty sick persons daily, practising venous injections in every case.
Further, in all true fishes the heart has only two sections an atrium that receives the venous blood from the veins, and a ventricle that propels it through a conical artery to the gills; the atrium was now divided into two halves, or right and left auricles, by an incomplete partition.
When people in general grow better acquainted with the laws underlying prenatal and postnatal child culture, natural living and the natural treatment of diseases, human beings will approach much more closely the normal in health, strength, beauty and longevity. Then will arise a true aristocracy, not of morbid, venous blue blood, but pulsating with the rich red blood of health.
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