books.google.com - Years in the making, this feast of mathematical ideas comprises works by 50 eminent French scholars. The first book of the two-volume set embraces "Mathematics: Concepts and Development," with several essays each under the categories of "Structures," Disciplines," "Space," "Function," "Group," "Probability,"...http://books.google.com/books/about/Great_Currents_of_Mathematical_Thought.html?id=CY6OMeJ0M4gC&q=Henri+Lebesgue&utm_source=gb-gplus-shareGreat Currents of Mathematical Thought