. On disorders of digestion, their consequences and treatment . ct, that the tubule, and especially the contractedpart of it, is very long. In tortoises no evaporation fromthe skincan take place, and in them the contracted part of the tubule isshort. This renders it probable that, while the ideas advanced byBowman and supiDorted by Heidenhain are in the main true, there-absorption of water on which Ludwig lays so much stress is also ABSORPTION IN THE URINARY TUBULES. 355 a most important factor in the secretion of urine under differentcircumstances. But it is not only rendered probable by the
. On disorders of digestion, their consequences and treatment . ct, that the tubule, and especially the contractedpart of it, is very long. In tortoises no evaporation fromthe skincan take place, and in them the contracted part of the tubule isshort. This renders it probable that, while the ideas advanced byBowman and supiDorted by Heidenhain are in the main true, there-absorption of water on which Ludwig lays so much stress is also ABSORPTION IN THE URINARY TUBULES. 355 a most important factor in the secretion of urine under differentcircumstances. But it is not only rendered probable by the facts of comparativeanatomy; it appears to be proved by direct experiment. Ribbert ^has extirpated the medullary substance of the kidney in therabbit while leaving the cortical substance. He has thus succeededin collecting the urine as it is excreted by the malpighian cor-puscles before it has passed through Henles loops, and has foundthat the urine secreted by the cortical substance alone is muchmore watery than that which is secreted by the entire kidney, a. Fig. 46.—Diagram .sLowing the form of the urinary tuLules in difFerent classes ofanimals, after Hiifner. 1. Fish. 2. Frog. 3. Tortoise. 4. Bird. 5. letters have the same significance in each. a. Capsule of the Convoluted tul3ule. c. Loop. d. CoUectiug tube, u in 2 indicates the trans-verse section of the ureter. fact which appears conclusively to prove that water is actuallyre-absorbed, and the urine rendered more concentrated, during itsj)assage through the tubules in the medullary substance. In the frog and triton the arrangement of the kidney is such as to allow of a much more complete investigation of the different factors in secretion than in mammals, because in amphibia the glomeruli which separate the water and the tubules which excrete ^ Eibbert, Virchows Archiv, July 1883, p. 189. A A 2 356 ON THE ACTION AND USE OF DIURETICS. the solids receive tlieir blood supply to a great extent inde
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