Published in 1938: The new volume presents a full and profusely illustrated account of progress made during the eighteenth century in Mathematics, Mechanics, Astronomy, Physics, Meteorology, Geography, Chemistry, Biology, Medicine, Psychology, Demography, Economics, Philosophy, and Technology.

Originally published in 1925, when it was published, this book was intended to give an up to date, concise account of the aim and methods of science with regards to Psychology. It contains chapters on various scientific methods such as the Evolutionary or Genetic Method, the Method of Difference and The Method of Residues, and chapters on probability and the laws of nature.