Science

What Happens When You Talk into a Telephone Receiver

A Typesetting Machine That Makes Mathematical Calculations

ARTIFICIAL ICE-MAKING

One midsummers day a fleet of United States war-ships were lying at anchor in Guantanamo Bay, on the southern coast of Cuba. The sky was cloudless, and the tropic sun shone so fiercely on the decks that the bare-footed Jackies had to cross the unshaded spots on the jump to save their feet.

PHYSICAL DIAGNOSIS

BRAIN AND MIND

HOW THE "RIDDLE OF THE SPHINX" WAS READ

by Henry Smith Williams

The development of the science of chemistry from the "science" of alchemy is a striking example of the complete revolution in the attitude of observers in the field of science. As has been pointed out in a preceding chapter, the alchemist, having a preconceived idea of how things should be, made all his experiments to prove his preconceived theory; while the chemist reverses this attitude of mind and bases his conceptions on the results of his laboratory experiments. In short, chemistry is what alchemy never could be, an inductive science.

THE "PNEUMATIC" CHEMISTS

JOHN DALTON AND THE ATOMIC THEORY