Clinical lectures on the principles and practice of medicine . ations have satisfied me that this is the processwhich a pneumonia undergoes on its removal. Iu this disease the exuda-tion is infiltrated into the air vesicles and minute bronchi, and betweenthe fibres, blood-vessels, and nerves of the parenchyma, imprisoning thewhole in a soft mass, which coagulates and renders the spongy textureof the lung more dense and heavy, or what is called hepatized. Thisaccomplished, no air can enter, the nerves are compressed, the circulationis in great part arrested; and the object of nature is now to c
Clinical lectures on the principles and practice of medicine . ations have satisfied me that this is the processwhich a pneumonia undergoes on its removal. Iu this disease the exuda-tion is infiltrated into the air vesicles and minute bronchi, and betweenthe fibres, blood-vessels, and nerves of the parenchyma, imprisoning thewhole in a soft mass, which coagulates and renders the spongy textureof the lung more dense and heavy, or what is called hepatized. Thisaccomplished, no air can enter, the nerves are compressed, the circulationis in great part arrested; and the object of nature is now to convert thesolid exudation once again into a fluid, whereby it can be partly evacuatedfrom the bronchi, but principally reabsorbed into the blood, and excreted 174 PRINCIPLES OF MEDICINE. from the economy. This is accomplished by cell-growth. In theamorphous coagulated exudation, granules are formed ; around groups ofthese cell-walls are produced, and gradually the solid amorphous mass isconverted into a fluid crowded with cells. This is pus. The cells, after. Fig. 154. passing through their natural life, die and break down, and thereby theexudation is again reduced to a condition susceptible of absorptionthrough the vascular walls, and once more mingles with the blood, butin an altered chemical condition. In the blood the changed exudation(now called fibrin) undergoes further chemical metamorphoses, whereby,according to Liebig, it is converted by means of oxygen into urate ofammonia, choleic acid, sulphur, phosphorus, and phosphate of urate of ammonia, by the further action of oxygen, is converted intourea and carbonic acid; the choleic acid into carbonic acid and carbonateof ammonia; the sulphur and phosphorus into sulphuric and phosphoricacids, which, combining with an alkali or earth form sulphates andphosphates. If it should happen that the quantity of oxygen taken isnot sufficient completely to accomplish this cycle of changes, then,instead of urea, either urate o
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmedicine, bookyear187
