JAMES now limited his teaching in Harvard University, as has been said, to half a course a year and tried to devote his working energies to formulating a statement of his philosophical conceptions. For two years he published almost nothing; then the essays which were subsequently collected in the volumes called "Pragmatism," "The Pluralistic Universe," "The Meaning of Truth," and "Essays in Radical Empiricism," began to appear in the philosophic journals, or were delivered as special lectures. Whenever he accepted invitations to lecture outside the College, as he still did occasionally, it was with the purpose of getting these conceptions expressed and of throwing them into the arena of discussion. But demands which correspondents and callers from all parts of the globe now made on his time and sympathy were formidable, for he could not rid himself of the habit of treating the most trivial of these with consideration, or acquire the habit of using a secretary. In this way there continued to be a constant drain on his strength. "It is probably difficult [thus he wrote wearily to Mr. Lutoslawski, who had begged him to collaborate with him on a book in 1904] for a man whose cerebral machine works with such facility as yours does to imagine the kind of consciousness of men like Flournoy and myself. The background of my consciousness, so far as my own achievements go, is composed of a _sense of impossibility_--a sense well warranted by the facts. For instance, two years ago, the 'Varieties' being published, I decided that everything was cleared and that my duty was immediately to begin writing my metaphysical system. Up to last October, when the academic year began, I had written some 200 pages of _notes_, _i.e._ disconnected _brouillons_. I hoped this year to write 400 or 500 pages of straight composition, and could have done so without the interruptions. As a matter of fact, with the best will in the world, I have written exactly 32 pages! For an academic year's work, that is not brilliant! You see that, when I refuse your request, it is, after a fashion, in order to save my own life. My working day is anyhow, _at best_, only three hours long--by working I mean writing and reading philosophy." This estimate of his "notes" was, as always, self-deprecatory; but there was no denying a great measure of truth to the statement. Frequently his health made it necessary for him to escape from Cambridge and his desk. These incidents will be noted separately wherever the context requires.