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When we add to these the larv� of flies and water beetles, the Crustaceans, Hydr� and Water Spiders, we must begin to realise that there are other things than a drowned natural fly for which the fish might mistake its imitation, with the materials of which it is made soaked in and drawn through the water.

Experiments show that a simple acute hydr�mia produces no increased transudation, and that a chronic hydr�mia, if connected with dropsy, is likely to be influential by increasing the permeability of the wall.

Even in those cases where a hydr�mia and an oedema co-exist, the localization of the latter is favored by obvious disturbances of the function of the capillary walls, as in case of the cutaneous oedema after scarlatina.

In like manner, a feeble heart, favoring venous stagnation, and gravitation are of importance, as general causes, in promoting dropsy in hydr�mic conditions.

Although experiments show that a simple plethora with great distension of the capillaries of the abdominal organs occasions no considerable increase of transudation, a different result follows a hydr�mic plethora25 induced by the injection of immense quantities of salt water into the blood-current—often six times as much liquid as the animal had blood.