weather a more active poison is secreted), the wound made will be more or less severe. It is advisable to get out of an adder's way. All the remaining reptiles in this country are two species of Frog, two species of Toad, and four Newts. They are not only most absolutely harmless, but, the frogs, at any rate, and toads, are ministers to man; and they belong to a class of animals more interesting than any other, perhaps, in the whole range of natural history. We are all well acquainted with the common frog, whose grander name is _Rana temporaria._ We see it--and it is to be feared some of us kill it--in our gardens, among strawberry-beds and damp vegetation. But, whereas frogs feed upon those slugs and insects which are in the habit of pasturing upon our plants, and are themselves indebted to us for not a grain of vegetable matter, we ought by all means to be grateful to them. So industrious are frogs in slug-hunting, that it would be quite worth while to introduce them as sub-gardeners upon our flower-beds. In catching insects, the frog suddenly darts out his tongue, which, at the hinder part, is loose, and covered with a gummy matter. The insect is caught, and the tongue returned with wonderful rapidity. The frog, when it is first hatched, has the constitution of a fish: it is purely aquatic; has a fish's heart, a fish's circulation, and a fish's gills. The tadpole swims as a fish does--by the movement, side-ways, of its tail. For the unassisted eye, and still more for the microscope, what spectacle can be more marvelous than the gradual process of change by which this tiny fish becomes a reptile? Legs bud; the fish-like gills dwindle by a vital process of absorption; the fish-like air-bladder becomes transmuted, as by a miracle, into the celled structure of lungs; the tail grows daily shorter, not broken off, but absorbed; the heart adds to its cells; the fish becomes a reptile as the tadpole changes to a frog. The same process we observe in toads; and it is also the same in our newts, excepting that in newts the tail remains. There is no parallel in nature to this marvelous and instructive metamorphosis.