The Kidney, Its Structure, Functions, and Diseases: Bright''s Disease, the Urine, Its Constituents, Chemical Tests for the Various Diseases, Their Symptoms and Treatment; Adapted to the Popular Comprehension (Classic Reprint)

Excerpt from The Kidney, Its Structure, Functions, and Diseases: Bright's Disease, the Urine, Its Constituents, Chemical Tests for the Various Diseases, Their Symptoms and Treatment; Adapted to the Popular Comprehension

The blood is the great nutritive principle. Blood consists of all the chemical elements contained in the tissues. This is conveyed to them by' the heart and arteries, and from it is deposited in them all the elements'required for their formation. In exchange, is returned such-parts as, having performed their duty, are cast off by nature as useless; Thus we have the process of assimilation, and this plas tic force is perfect when in health, as is shown by-the absorption of the virus in vaccination, and b the formation of eschars after the heal ing 0 wounds. Parts having once changed their condition remain so, though still havmg' a tendency to return to the normal state. We have a fine illustration of this law in second ary syphilis and its. Promulgation. When a tissue remains in the normal'state as_regards' its capacity for action, the process of nutrition and elimination goon in the regular manner, and the part' remains of the same size and power; but bring the tissue into a little more action, and we see a change; there is an ln crease of nutrition, and consequent bulk - [zy pe'rtropny. This results from more particles being added to the tissue to compensate for the largeramount of power required. This is beautifully illustrated in the increased size of the arm of the blacksmith and the legs of the dancer.

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