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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.

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.

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.