A children's science book in which "Uncle Paul" teaches the basic principles of chemistry to his two nephews. Through his conversation and simple experiments their fascination for the subject is awakened. From the translator's preface: “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.’" - Summary by Belinda Mc and Florence Constable Bicknell
