While American children once learned to add by reading a poster of animals and birds, they do it now by playing games on computers. Each step in between—whether it be a box of blocks or exercises ...

THE two volumes of this history (the first of which was noticed in NATURE of November 15, 1924) deal with the subject from two different aspects. The first volume, described as a “General Survey,” is ...

IT is only during the last fifty or sixty years that the history of mathematics has been systematically studied. In that time, however, the field has been gradually covered by an increasing number of ...