This section is from the book "The Balance Of Nature And Modern Conditions Of Cultivation", by George Abbey. Also available from Amazon: The Balance Of Nature And Modern Conditions Of Cultivation.
Our experience of this familiar animal in a state of confinement is restricted to a fernery under glass, where a three-legged one, with others, throve for several years, the one with a leg cut off by a scythe in mowing meadow grass, and named "Lord Raglan" - it was the time of the Crimean War - being docile, making quick work of worms, slugs, woodlice, etc., presented to it, and always in summer time taking up a position beneath a water-tap, which was so left that now and again water dropped on the frog's back, the animal so placing itself that the water fell just behind the eyes and trickled over the whole body.
In gardens we have found frogs useful in destroying worms, slugs, woodlice, insects and their larvae; but frogs are more suited to the semi-wild and wilderness side of nature rather than that of cultivation, though this certainly profits by the decimation of pests by frogs in rough places by ditches, etc.; especially gnats.