This creature, whose humming salutation, while she makes her airy circles about our bed, gives terrific warning of the sanguinary operation in which she is ready to engage, was a few hours ago the inhabitant of a stagnant pool, more in shape like a fish than an insect. Then to have been taken out of the water would have been speedily fatal; now it could as little exist in any other element than air. Then it breathed through its tail; now through openings in its sides. Its shapeless head, in that period of its existence, is now exchanged for one adorned with elegantly tufted antennas, and furnished, instead of jaws, with an apparatus more artfully constructed than the cupping-glasses of the phlebotomist; an apparatus, which, at the same time that it strikes in the lancets, composes a tube for pumping up the flowing blood.