Animal Plants: Life Adapted to a Vacuum

"These remarkable creatures combine the characteristics of animals and plants and so I call them animal-plants. ..." "All right. Don't get angry. Just explain how your creatures avoid getting dried up like mummies." "That is simple. Their skin is covered with a glassy layer, thin and flexible but absolutely impermeable to gases and liquids and all kinds of particles, so that the creatures are protected from any loss of material. . . . Their bodies have appendages which look like wings and a...

 The Hourglass

Not the flowing waters of time but the falling sands of time have given modern poets their favorite metaphor for the passing hours. In England, sandglasses were frequently placed in coffins as a symbol that life's time had run out. "The sands of time are sinking," went the hymn. "The dawn of heaven breaks." But the hourglass, measuring time by dripping sand, comes late in our story. Sand was, of course, less fluid than water, and hence less adapted to the subtle calibration required by the v...

 The Art of Preserving Health

The blood, the fountain whence the spirits flow, The generous stream that waters every part, And motion, vigour, and warm life conveys To every Particle that moves or lives; This vital fluid, thro' unnumber'd tubes Pour'd by the heart, and to the heart again Refunded; scourg'd forever round and round; Enrag'd with heat and toil, at last forgets Its balmy nature; virulent and thin It grows; and now, but that a thousand gates Are open to its flight, it would destroy The parts it cherish' d and ...