My dear L,--Among the _lions_ whom you missed by one accident or another on your late travels in Europe, I observe that you recur to none with so much regret as Professor Wilson; you dwell upon this one disappointment as a personal misfortune; and perhaps with reason; for, in the course of my life, I have met with no man of equally varied accomplishments, or, upon the whole, so well entitled to be ranked with that order of men distinguished by brilliant versatility and ambidexterity--of which order we find such eminent models in Alcibiades, in Caesar, in Crichton, in that of Servan recorded by Sully, and in one or two Italians. Pity that you had not earlier communicated to me the exact route you were bound to, and the particular succession of your engagements when you visited the English Lakes; since, in that case, my interest with Professor Wilson (supposing always that you had declined to rely upon the better passport of your own merits as a naturalist) would have availed for a greater thing than at that time stood between you and the introduction which you coveted. On the day, or the night rather, when you were at Bowness and Ambleside, I happen to know that Professor Wilson's business was one which might have been executed by proxy, though it could not be delayed; and I also know that, apart from the _general_ courtesy of his nature, he would, at all times, have an especial pleasure in waiving a claim of business for one of science or letters, in the person of a foreigner coming from a great distance; and that in no other instance would he make such a sacrifice so cordially as on behalf of an able naturalist. Perhaps you already know from your countryman, Audubon, that the Professor is himself a naturalist, and of original merit; in fact, worth a score of such meagre bookish naturalists as are formed in museums and by second-hand acts of memory; having (like Audubon) built much of his knowledge upon personal observation. Hence he has two great advantages: one, that his knowledge is accurate in a very unusual degree; and another, that this knowledge, having grown up under the inspiration of a real interest and an unaffected love for its objects,--commencing, indeed, at an age when no affectation in matters of that nature could exist,--has settled upon those facts and circumstances which have a true philosophical value: habits, predominant affections, the direction of instincts, and the compensatory processes where these happen to be thwarted,--on all such topics he is learned and full; whilst, on the science of measurements and proportions, applied to dorsal-fins and tail-feathers, and on the exact arrangement of colours, &c.--that petty upholstery of nature, on which books are so tedious and elaborate,--not uncommonly he is negligent or forgetful. What may have served in later years to quicken and stimulate his knowledge in this field, and, at any rate, greatly to extend it, is the conversation of his youngest brother, Mr.