"Science and Hypothesis" is a study written in 1902, by the French mathematician, Henri Poincaré. It was designed with non-specialist readers in mind, and contains information on mathematics, space, physics and biology. The main theme of this work is that the absolute truth of science is non-existent. It postulates that many scientific beliefs are closer to convenient conventions than valid explanations. The chapters of this book include: "Number and Magnitude", "On the Nature of Mathematical Reasoning", "Mathematical Magnitude and Experiment", "Space", "Non-Euclidean Geometries", "Space and Geometry", "Experiment and Geometry", etcetera. Many vintage texts such as this are increasingly scarce and expensive, and it is with this in mind that we are republishing this book now, in an affordable, high-quality, modern edition. It comes complete with a specially commissioned biography of the author.