On the action of some diuretica and other drugs upon the glomeruli

From the results of my experiments the conclusion may be summarized as follows. 1. Caffeine, caffeine sodio-benzoate and diuretin have dilator effect upon the glomerular capillaries and the circulation in them becomes more rapid. The quantity of blood which flows through them increases and a number of glomeruli, hitherto unobserved, become visible. On the other hand, theocin and glucose have no effect upon the glomeruli. 2. Solution of potassium acetate causes a remarkable contraction and at the same time the glomeruli till then observed, become invisible. 3. Kreatin produces a dilatation of glomerular capillaries and accordingly the circulation in them becomes more rapid and also the number of glomeruli increased. Guanidin in a solution weaker than 0.4 p. c. causes dilatation of glomerular capillaries and increase of the quantity of blood which flows through them and also it causes the increase of verocity of blood flow in the glomerular capillaries. The glomeruli, hitherto stationary, become active and the number of them increases. On the contrary, a solution stronger than 0.5 p. c. always causes contraction of glomerular capillaries and the number of glomeruli are decreased. 4. Isotonic solution (with 0.6% Ringer's solution) of NaNO(2), NaNO(3) and Na(2)HPO(4) causes a slight dilatation of glomerular capillaries and accordingly the increase of verocity of blood flow in them and of quantity of blood flowing through them are produced. But other sodium salts have no effect upon the glomeruli. All of potassium salts, on the contrary, have an opposite effect upon the glomeruli to that of sodium salts. 5. Calcium salts and magnesium salts (isotonic with 0.6% Ringer's solution) and some organic substances (m/100 in density) have a remarkable dilator effect upou the glomerular capillaries and cause the increase of verocity of blood flow in them and of quantity of blood which flows through them. Glomeruli are increased in number und are remarkably congested and swollen.

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