Another thing which specially attracted my attention was his wonderfully retentive memory. If we remember the many years he has spent in Africa, deprived of books, we may well think it an uncommon memory that can recite whole poems from Byron, Burns, Tennyson, Longfellow, Whittier, and Lowell. The reason of this may be found, perhaps, in the fact, that he has lived all his life almost, we may say, within himself. Zimmerman, a great student of human nature, says on this subject "The unencumbered mind recalls all that it has read, all that pleased the eye, and delighted the ear; and reflecting on every idea which either observation, or experience, or discourse has produced, gains new information by every reflection. The intellect contemplates all the former scenes of life; views by anticipation those that are yet to come; and blends all ideas of past and future in the actual enjoyment of the present moment." He has lived in a world which revolved inwardly, out of which he seldom awoke except to attend to the immediate practical necessities of himself and people; then relapsed again into the same happy inner world, which he must have peopled with his own friends, relations, acquaintances, familiar readings, ideas, and associations; so that wherever he might be, or by whatsoever he was surrounded, his own world always possessed more attractions to his cultured mind than were yielded by external circumstances. The study of Dr. Livingstone would not be complete if we did not take the religious side of his character into consideration. His religion is not of the theoretical kind, but it is a constant, earnest, sincere practice. It is neither demonstrative nor loud, but manifests itself in a quiet, practical way, and is always at work. It is not aggressive, which sometimes is troublesome, if not impertinent. In him, religion exhibits its loveliest features; it governs his conduct not only towards his servants, but towards the natives, the bigoted Mohammedans, and all who come in contact with him. Without it, Livingstone, with his ardent temperament, his enthusiasm, his high spirit and courage, must have become uncompanionable, and a hard master. Religion has tamed him, and made him a Christian gentleman: the crude and wilful have been refined and subdued; religion has made him the most companionable of men and indulgent of masters--a man whose society is pleasurable.