5. The present course of Lectures will be followed, if I am able to fulfill the design of them, by one of a like elementary character on Architecture; and that by a third series on Christian Sculpture: but, in the meantime, my effort is to direct the attention of the resident students to Natural History, and to the higher branches of ideal Landscape: and it will be, I trust, accepted as sufficient reason for the delay which has occurred in preparing the following sheets for the press, that I have not only been interrupted by a dangerous illness, but engaged, in what remained to me of the summer, in an endeavor to deduce, from the overwhelming complexity of modern classification in the Natural Sciences, some forms capable of easier reference by Art students, to whom the anatomy of brutal and floral nature is often no less important than that of the human body. The preparation of examples for manual practice, and the arrangement of standards for reference, both in Painting and Sculpture, had to be carried on, meanwhile, as I was able. For what has already been done, the reader is referred to the "Catalogue of the Educational Series," published at the end of the Spring Term: of what remains to be done I will make no anticipatory statement, being content to have ascribed to me rather the fault of narrowness in design, than of extravagance in expectation. DENMARK HILL, _25th November, 1871._ FOOTNOTES: [1] Photography cannot exhibit the character of large and finished sculpture; but its audacity of shadow is in perfect harmony with the more roughly picturesque treatment necessary in coins. For the rendering of all such frank relief, and for the better explanation of forms disturbed by the luster of metal or polished stone, the method employed in the plates of this volume will be found, I believe, satisfactory. Casts are first taken from the coins, in white plaster; these are photographed, and the photograph printed by the autotype process. Plate XII. is exceptional, being a pure mezzotint engraving of the old school, excellently carried through by my assistant, Mr. Allen, who was taught, as a personal favor to myself, by my friend, and Turner's fellow-worker, Thomas Lupton. Plate IV. was intended to be a photograph from the superb vase in the British Museum, No. 564 in Mr. Newton's Catalogue; but its variety of color defied photography, and after the sheets had gone to press I was compelled to reduce Le Normand's plate of it, which is unsatisfactory, but answers my immediate purpose. The enlarged photographs for use in the Lecture Room were made for me with most successful skill by Sergeant Spackman, of South Kensington; and the help throughout rendered to me by Mr. Burgess is acknowledged in the course of the Lectures; though with thanks which must remain inadequate lest they should become tedious; for Mr. Burgess drew the subjects of Plates III., X., and XIII.; and drew and engraved every wood-cut in the book.