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Already the fluid is at the top of the cane: now I can light it and make it serve as a candle. The fluid has risen by the capillary attraction of the piece of cane, just as it does through the cotton in the candle. Now, the only reason why the candle does not burn all down the side of the wick is, that the melted tallow extinguishes the flame.
The blood is dark red under ordinary conditions, but may be purplish, or even black, if the respiration is interfered with. When one of the large veins in the neck is wounded, the effects of respiration produce a rise and fall in the stream which may resemble arterial pulsation. In capillary hæmorrhage, red blood escapes from numerous points on the surface of the wound in a steady ooze.
On the other was a capillary glass tube at the junction of two aluminum arms, also at right angles to each other. It was quite like old times to see Kennedy at work in his laboratory preparing for a "seance." He said nothing as I watched him curiously, and I asked nothing. Two sets of wires were attached to each of the instruments, and these he carefully concealed and led out the window.
The coughing up of blood from the lungs is known as hæmoptysis; vomiting of blood from the stomach, as hæmatemesis; the passage of black-coloured stools due to the presence of blood altered by digestion, as melæna; and the passage of bloody urine, as hæmaturia. Hæmorrhage is known as arterial, venous, or capillary, according to the nature of the vessel from which it takes place.
Pressure facilitates evaporation, and on more closely examining this reaction we arrive at the conclusion that vapour can never spontaneously condense itself when liquid drops already formed are not present, unless forces of another nature intervene to diminish the effect of the capillary forces.
But soon after emerging from the bath, a more florid colour and a greater degree of heat is generated on the skin than was possessed before immersion; for the capillary glands, after this quiescent state, occasioned by the want of stimulus, become more irritable than usual to their natural stimuli, owing to the accumulation of sensorial power, and hence a greater quantity of blood is transmitted through them, and a greater secretion of perspirable matter; and, in consequence, a greater degree of heat succeeds.
At last, when over-taut, they loosen without breaking and resume their original form. They lengthen by unrolling their twist, they shorten by rolling it again; lastly, they become adhesive by taking the glaze of the gummy moisture wherewith they are filled. In short, the spiral thread is a capillary tube finer than any that our physics will ever know.
By regulating the rate of drawing and the length of tube heated, the desired length and diameter of capillary may be obtained. The tube should always be rotated and kept in a straight line until the glass has set, so that the capillary may have the same axis as the main tube.
What is more, the theory of Natural Selection cannot be kept out of schools, because many of the natural facts that present the most plausible appearance of design can be accounted for by Natural Selection; and it would be so absurd to keep a child in delusive ignorance of so potent a factor in evolution as to keep it in ignorance of radiation or capillary attraction.
This filament either joins with a neighbouring capillary or with a similar filament, and in time these become hollow and are filled with blood from the vessels that gave them origin. In this way a series of young capillary loops is formed.
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