During his comparatively brief career, Dr. Oliver had become widely known as a medical and general scholar. As a teacher in the various departments of medical science with which he was connected he was also eminently successful. His lectures, always prepared with great care, were written with remarkable clearness and elegance, and were often listened to with attention by many outside the ranks of the profession. "His lectures to the under-graduates of the college," says a contemporary,[45] "would be thought, I am persuaded, still more remarkable than those upon Physiology. They were intended to exhibit the present state of mental philosophy. And the singular clearness with which he discriminated the settled points of absolute knowledge in this comprehensive and yet imperfect science, his happy development of intricate and complicated principles, and the beautiful colors which a true poetic spirit enabled him now and then to throw over the bald peaks and angles of this cold region, entitle him to a rank among metaphysicians as eminent as he maintained in his appropriate profession." [45] Eulogy on Daniel Oliver, delivered by Rev. C. B. Haddock, professor of Belles Lettres. "The intellectual character of Dr. Oliver," the same writer afterwards adds, in language admirably chosen, "came nearer than it has been my fortune to observe in almost any other instance to the idea of a perfect scholar. He was at once profound, comprehensive, and elegant. Upon no subject which he had considered was his knowledge fragmentary or partial. A philosophic, systematic habit of mind led him always to seek for the principles of things, and to be satisfied only with the truth. The compass of his inquiries was as extraordinary as their depth. He had investigated with care a surprising extent of knowledge. A master of his own language, and minutely acquainted with all its principal productions, he was also thoroughly versed in the Greek, and familiar with the original works which have given to that tongue the first place among human dialects. The German he read with facility, and had pursued his favorite studies in the masters of its profound learning. Of French and Italian he was not ignorant. Music, both as a science and an art, was his delight and recreation. In the arts of painting and sculpture his information was liberal and his taste said to be excellent. Morals and politics he had studied in their theory, and in the history of the world. His acquaintance with civil history was among the most extraordinary of his attainments. The beautiful in Nature, in life, or in art or literature, few men have so exquisitely enjoyed or so justly appreciated. "Thus, the principal elements of a perfect mind seem to have been singularly united and harmonized in him,--exactness of knowledge, liberal learning, and true taste."