Lewes in early life had a strong inclination to become an actor, and he did go on the stage for a short time. He wrote and translated several plays, one of his adaptations becoming very popular. He wrote dramatic criticisms for the _Pall Mall Gazette_ and other journals, during many years. In 1875, a volume of these papers was published with the title, _On Actors and the Art of Acting_. It treated in a pleasant way, and with keen insight, of Edmund Kean, Charles Kean, Rachel, Macready, Fan-en, Charles Matthews, Frédéric Lemaitre, the two Keeleys, Shakspere as actor and critic, natural acting, foreign actors on our stage, the drama of Paris in 1865, Germany in 1867, and Spain in 1867, and of his first impressions of Salvini. Another piece of work done by him was the furnishing, in 1867, of an explanatory text to accompany Kaulbach's _Female Characters of Goethe_. The last years of Lewes's life were devoted to the preparation of a systematic exposition of his physiological philosophy. As early as the year 1858, he was at work on the nervous system, and, soon after, his studies took a systematic shape. In his series of volumes on the _Problems of Life and Mind_ he gave to the world a new theory of the mind and of knowledge. In the first two volumes, published in 1874, and entitled _The Foundations of a Creed_, he developed his views on the methods of philosophic research. These were followed in 1877 by a third volume, on _The Physical Basis of Life_. After his death his wife edited two small volumes on Psychology, which included all the writing he left in a form ready for publication. His work was left incomplete, but its publication had gone far enough to show the methods to be followed and the main conclusions to be reached. Concerning the work done by Lewes in philosophy, there will be much difference of opinion. He did much through his various expositions to make the public familiar with the inductive methods of inquiry and with the conclusions of positive thought. He made his books readable, and even popular, giving philosophy an exposition suited to the wants of the general reader. At the same time, he was polemical and dogmatic, and more concerned to be clever than to be exact in his interpretation. Into the meanings of some of the greatest thinkers he had little clear insight, and he is seldom to be implicitly trusted as an expositor of those whose systems were in any way opposed to his own. His limitations have been well defined by Ribot, in his _Contemporary English Psychology_.