Percival held one peculiar opinion concerning a branch of college education. He objected to the modern practice of teaching the natural sciences by means of a profusion of drawings, models, showy experiments, and other expedients addressing the mind so strongly through the eye. While these might be allowable in popular lectures, before audiences lacking in early intellectual discipline, where amusement was a consideration, and where without it the public ear could not be secured, he thought that the collegian should study differently,--that his understanding should be taxed severely, and that he should be inured, from the first, to rigid attention, in order to a lasting remembrance of the truths offered to him. It would be a useful exercise for the instructor, he thought, to elucidate obscure phenomena and complicated structures by words only, assisting himself, perhaps, occasionally, by extemporaneous drawings. Such a course would inspire the scholar with deference for his teacher, and confidence in his own ability to acquire a similar grasp of the subject. While there is certainly some truth in this opinion, it would not be difficult, perhaps, to invalidate its general force. Why should the ear be the only admitted means of acquiring knowledge? Nature, the greatest of teachers, does not judge thus: she conveys half her wisdom to us by sight, instead of by faith; she gives her first lessons to the infant through the eye. Would Percival, in looking for his attentive audiences, have preferred a congregation of blind men? Speaking of literary composition, he said that he often took great pains with his productions, shifting words and phrases in many ways, before satisfying himself that he had attained the best form of expression; and he assured me that these slowly elaborated passages were the very ones in which he afterwards recognized the most ease and nature, and which others supposed him to have thrown off carelessly. I asked him how it was that children, in their unpremeditated way, expressed themselves with so much directness and beauty. They have but a single idea to present at a time, he said; they seize without hesitation on the first words that offer for its expression, unperplexed by any such choice of terms as would surely occur to maturer minds; and most important of all, perhaps, they are wholly unembarrassed by limiting qualifications arising from a fuller knowledge of the subject.