My Philosophical Development is a book written by Bertrand Russell

Bertrand Russell

Bertrand Arthur William Russell, 3rd Earl Russell, OM, FRS was a British philosopher, logician, mathematician, historian, and social critic. At various points in his life he considered himself a liberal, a socialist, and a pacifist, but he also admitted that he had never been any of these things...

 where he is summing up his philosophical beliefs and how they have changed during his life.

In this book Russell gives an account of his philosophical development. He tells of his Hegelian

Georg Wilhelm Friedrich Hegel

Georg Wilhelm Friedrich Hegel was a German philosopher, one of the creators of German Idealism. His historicist and idealist account of reality as a whole revolutionized European philosophy and was an important precursor to Continental philosophy and Marxism.Hegel developed a comprehensive...

 period and includes hitherto unpublished notes for a Hegelian philosophy of science. He deals next with the two-fold revolution involved with his abandonment of idealism

Idealism

In philosophy, idealism is the family of views which assert that reality, or reality as we can know it, is fundamentally mental, mentally constructed, or otherwise immaterial. Epistemologically, idealism manifests as a skepticism about the possibility of knowing any mind-independent thing...

 and adoption of a mathematical logic

Mathematical logic

Mathematical logic is a subfield of mathematics with close connections to foundations of mathematics, theoretical computer science and philosophical logic. The field includes both the mathematical study of logic and the applications of formal logic to other areas of mathematics...

 founded upon that of Peano

Giuseppe Peano

Giuseppe Peano was an Italian mathematician, whose work was of philosophical value. The author of over 200 books and papers, he was a founder of mathematical logic and set theory, to which he contributed much notation. The standard axiomatization of the natural numbers is named the Peano axioms in...

. After two chapters on Principia Mathematica

Principia Mathematica

The Principia Mathematica is a three-volume work on the foundations of mathematics, written by Alfred North Whitehead and Bertrand Russell and published in 1910, 1912, and 1913...

, he passes to the problems of perception as dealt with in Our Knowledge of the External World. There is a chapter on ‘The Impact of Wittgenstein

Ludwig Wittgenstein

Ludwig Josef Johann Wittgenstein was an Austrian philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language. He was professor in philosophy at the University of Cambridge from 1939 until 1947...

’ in which he examines what he now thinks must be accepted and what rejected in that philosopher’s work. He notes the changes from earlier theories required by the adoption of William James’s

William James

William James was a pioneering American psychologist and philosopher who was trained as a physician. He wrote influential books on the young science of psychology, educational psychology, psychology of religious experience and mysticism, and on the philosophy of pragmatism...

view that sensation is not essentially relational and is not per se a form of knowledge. In an explanatory chapter, he endeavours to remove misconceptions of and objections to his theories as to the relation of perception to scientific knowledge. The book concludes with a reprint of some articles on modern Oxford philosophy.
It is republished by Spokesman Bookshttp://www.spokesmanbooks.com/acatalog/Bertrand_Russell_Philosophical_Writings.html#a242 (2008)