I am sorry to hear that you are so poorly, and wish I could help you to sit down and work quietly at pure science. You have got into a whirlpool, and should stroke vigorously at the proper angle, not attempt to breast the whole force of the current, nor yet give in to it. Do take the counsel of a quiet looker on and withdraw to your books and studies in pure Natural History; let modes of thought alone. You may make a very good naturalist, or a very good metaphysician (of that I know nothing, don't despise me), but you have neither time nor place for both. However, it must be remarked that this love of philosophy, not recently acquired either, was only part of the passion for general principles underlying the facts of science which had always possessed him. And the time expended upon it was not directly taken from the hours of scientific work; he would read in bed through the small hours of the night, when sleep was slow in coming to him. In this way he got through an immense amount of philosophy in the course of several years. Not that he could "state the views of so and so" upon any given question, or desired such kind of knowledge; he wished to find out and compare with his own the answers which other thinkers gave to the problems which interested himself. A gentler reproof of this time touches his handwriting, which was never of the most legible, so that his foreign correspondents in particular sometimes complained. Haeckel used to get his difficulties deciphered by his colleague Gegenbaur. I cannot forbear quoting the delicate remonstrance of Professor Lacaze du Thiers, and the flattering remedy he proposed:-- March 14. Je lis l'Anglais imprime, mais vos ecritures anglaises sont si rapides, qu'il m'est quelquefois difficile de m'en sortir. On me dit que vous ecrivez si bien le francais que je crois que je vous lirais bien mieux dans ma langue! On his return from examining at Dublin, he again looked over proofs for Mr. Spencer.] Jermyn Street, August 3, 1861. My dear Spencer,