and air-and much, much more. From the translator's preface: "The personal, biographical interest of the book is not to be overlooked. The boys Jules and Emile are the author's own children; faithfully portrayed even to the names they bear. In his captivating fashion the man of vast learning makes himself at once teacher and comrade to his young hearers, and we learn that 'his chemistry lessons especially had a great success.' "With apparatus of his own devising and of the simplest kind he could perform a host of elementary experiments, the apparatus as a rule consisting of the most ordinary materials, such as a common flask or bottle, an old mustard-pot, a tumbler, a goose-quill or a pipe-stem. "A series of astonishing phenomena amazed their wondering eyes. He made them see, touch, taste, handle, and smell, and always 'the hand assisted the word,' always 'the example accompanied the precept,' for no one more fully valued the profound maxim, so neglected and misunderstood, that 'to see is to know.' "