Morris Fishbein traces medicine's journey from guesswork and tradition to a disciplined science built on observation, experiment, and evidence. With brisk clarity, he contrasts the old family doctor's limited tools with landmark advances such as percussion, the stethoscope, X-rays, laboratory tests, antiseptics, surgery, vaccines, and serums, showing how modern diagnosis and treatment made medicine safer, more precise, and more humane. He also celebrates the breakthroughs of Pasteur and Ko...