The new subjects which he offered at Harvard during the nineties are indicative of the directions in which his mind was moving. In the first winter after his return he gave a course on Cosmology, which he had never taught before and which he described in the department announcement as "a study of the fundamental conceptions of natural science with especial reference to the theories of evolution and materialism," and for the first time announced that his graduate "seminar" would be wholly devoted to questions in mental pathology "embracing a review of the principal forms of abnormal or exceptional mental life." In 1895 the second half of his psychological seminar was announced as "a discussion of certain theoretic problems, as Consciousness, Knowledge, Self, the relations of Mind and Body." In 1896 he offered a course on the philosophy of Kant for the first time. In 1898 the announcement of his "elective" on Metaphysics explained that the class would consider "the unity or pluralism of the world ground, and its knowability or unknowability; realism and idealism, freedom, teleology and theism."[2] But there is another aspect of the nineties which must be touched upon. After getting back "to harness" in 1893 James took up, not only his full college duties, but an amount of outside lecturing such as he had never done before. In so doing he overburdened himself and postponed the attainment of his true purpose; but the temptation to accept the requests which now poured in on him was made irresistible by practical considerations. He not only repeated some of his Harvard courses at Radcliffe College, and gave instruction in the Harvard Summer School in addition to the regular work of the term; but delivered lectures at teachers' meetings and before other special audiences in places as far from Cambridge as Colorado and California. A number of the papers that are included in "The Will to Believe and Other Essays in Popular Philosophy" (1897) and "Talks to Teachers and Students on Some of Life's Ideals" (1897) were thus prepared as lectures. Some of them were read many times before they were published. When he stopped for a rest in 1899, he was exhausted to the verge of a formidable break-down.