Certainly not all cases of renal dropsy show diminution in the excretion of chlorides.
During excretion they irritate the kidneys and the sweat-glands, and thereby increase the excretion of urine and of sweat.
This, like the excretion of the sundew and other insectivorous plants, contains a digestive ferment (or enzyme) which renders the nitrogenous substances of the body of the insect soluble, and capable of absorption by the leaf.
Salicylic acid and salicin (q.v.) share the properties common to the group of aromatic acids, which, as a group, are antiseptic without being toxic to man - a property practically unique; are unstable in the body; are antipyretic and analgesic; and diminish the excretion of urea by the kidneys.
Stomata are often absent, absorption and excretion of gases in solution being carried on through the epidermal layer.