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Updated: May 10, 2025
The breath passes through and round about the lungs bathes the surfaces of the viscera, and enters the cavities of the bones; it even penetrates into some spaces between the muscles of the neck and thus not only is the most perfect oxygenation of the blood secured, but, the temperature of the blood being very high, the air in every part is rarefied, and the great lightness and vigour provided for, that the habits of birds require.
Nothing so interferes with the inflow of the life force, with free and normal circulation of blood and lymph and with the oxygenation and combustion of food materials and systemic waste as the accumulation of morbid matter and poisons in the tissues of the body. This I have endeavored to explain more fully in connection with lowered vitality.
Many vegetable seeds are surrounded with air in their pods or receptacles, as peas, the fruit of staphylea, and lichnis vesicaria; but it is probable, that those seeds, after they are shed, as well as the spawn of fish, by the situation of the former on or near the moist and aerated surface of the earth, and of the latter in the ever-changing and ventilated water, may not be in need of an apparatus for the oxygenation of their first blood, before the leaves of one, and the gills of the other, are produced for this purpose.
In respect to the imagination of the mother, it is difficult to comprehend, how this can produce any alteration in the fetus, except by affecting the nutriment laid up for its first reception, as described in No. V. 2. of this section, or by affecting the nourishment or oxygenation with which she supplies it afterwards.
The shade of colour varies with the stage of the inflammation, being lighter and brighter in the early, hyperæmic stages, and darker and duskier when the blood flow is slowed or when stasis has occurred and the oxygenation of the blood is defective. In the thrombotic stage the part may assume a purplish hue.
In these an elongated creeping bud is protruded, and, where it touches the ground, takes root, and produces a new plant derived from its father, from which it acquires both nutriment and oxygenation; and in consequence needs no maternal apparatus for these purposes.
We have, besides, studied the influence of isotony, of agitation, and of oxygenation, and these experiments have enabled me to ascertain the best physical conditions required for the survival of nervous tissue. In 1910, Burrows, employing the technique of Harrison, obtained results similar to his with fragments of embryonic chickens.
For if the female be supposed to form an equal part of the embryon, why should she form the whole of the apparatus for nutriment and for oxygenation? the male in many animals is larger, stronger, and digests more food than the female, and therefore should contribute as much or more towards the reproduction of the species; but if he contributes only half the embryon and none of the apparatus for sustenance and oxygenation, the division is unequal; the strength of the male, and his consumption of food are too great for the effect, compared with that of the female, which is contrary to the usual course of nature.
During the next minute the respirations are not more than one or two, and the heart has fallen really below, in some cases, the standard beat, showing most conclusively that once oxygenation has taken place and that the free carbonic acid gas has been so completely consumed, that there is no involuntary call through the pneumogastric nerve for a supply of oxygen.
Oxygenation of the chick in the egg, of feeds. III. The liquor amnii is not excrementitious. It is nutritious. It is found in the esophagus and stomach, and forms the meconium. Monstrous births without heads. Question of Dr. Harvey.
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