Edward Wheeler Scripture was an American physician and psychologist. He founded the experimental psychology laboratory at Yale University, directed the Vanderbilt Speech Clinic at Columbia University, and was a founder of the American Psychological Association. "Are you not afraid that all this accurate and fine work in the laboratory will be public?" a fellow psychologist once asked me. The solution is in this book. You, my dear reader, and I don't have the time, desire, or resources to spend years studying the specifics of the physical laboratory or observatory, but we both enjoy reading about the most recent developments in electricity from a physicist or seeing a collection of brand-new moon photos from an astronomer. Because life is so brief, a person can only master one skill at a time, whether it is the most effective way to dye cambric or build locomotives.