This is an animal so well known, that it needs no description : but some of its properties are very singular. Its spring, or power of taking large leaps, is remarkably great, and it is the best swimmer of all four-footed animals. Its parts are finely adapted for those ends, the fore members of the body being very lightly made, the hind legs and thighs very long, and furnished with very strong muscles. While in a tadpole state, it is entirely a water animal, for in this element the spawn is cast. As soon as frogs are released from their tadpole state, they immediately take to land; and if the weather has been hot, and there fall any refreshing showers, the ground for a considerable space is perfectly blackened by myriads of these animalcules, seeking for some secure lurking places. Some persons not taking time to examine into this phenomenon, imagined them to have been generated in the clouds, and showered on the earth : but had they, like Mr. Derham, traced them to the next pool, they would have found a better solution of the difficulty. As frogs adhere closely to the backs of their own species, so we know they will do the same by fish. That they will injure, if not entirely kill carp, is a fact indisputable, from the following relation.

Not many years ago, on fishing a pond belonging to Mr. Pitt, of Encomb, Dorsetshire, great numbers of the carp were found, each with a frog mounted on it, the hind legs clinging to the back, and the fore legs fixed to the corner of each eye of the fish, which were thin and greatly wasted, teased by carrying so disagreeable a load. The croaking of frogs is well known; and from that, in fenny countries, they are distinguished by ludicrous titles, - thus they are styled Dutch nightingales, and Boston waites. Yet there is a time of the year when they become mute, neither croaking nor opening their mouths for a whole month ; this happens in the hot season, and that is in many places known to the country people by the name of the paddock-moon. It is said, that during that period their mouths are so closed, that no force (without killing the animal) will be capable of opening them. These, as well as other reptiles, feed but a small space of the year. Their food is flies, insects, and snails. During winter, frogs and toads remain in a torpid state; the last of which will dig into the earth, and cover themselves with almost the same agility as the mole.