Not having succeeded very well with attempts to create intercourse through studies and amusements, the father next consoles himself with the idea that he will convert his son into an intimate friend; but shortly discovers that there are certain difficulties, of which a few may be mentioned here. Although the relationship between father and son is a very near relationship, it may happen that there is but little likeness of inherited idiosyncrasy, and therefore that the two may have different and even opposite tastes. By the law or accident of atavism a boy may resemble one of his grandfathers or some remoter ancestor, or he may puzzle theorists about heredity by characteristics for which there is no known precedent in his family. Both his mental instincts and processes, and the conclusions to which they lead him, may be entirely different from the habits and conclusions of his father; and if the father is so utterly unphilosophical as to suppose (what vulgar fathers constantly _do_ suppose) that his own mental habits and conclusions are the right ones, and all others wrong, then he will adopt a tone of authority towards his son, on certain occasions, which the young man will excusably consider unbearable and which he will avoid by shunning the paternal society. Even a very mild attempt on the father's part to impose his own tastes and opinions will be quietly resented and felt as a reason for avoiding him, because the son is well aware that he cannot argue on equal terms with a man who, however amiable he chooses to be for the moment, can at any time arm himself with the formidable paternal dignity by simply taking the trouble to assume it. The mere difference of age is almost an insuperable barrier to comradeship; for though a middle-aged man may be cheerful, his cheerfulness is "as water unto wine" in comparison with the merriment of joyous youth. So exuberant is that youthful gayety that it often needs to utter downright nonsense for the relief of its own high spirits, and feels oppressed in sober society where nonsense is not permitted. Any elderly gentleman who reads this has only to consult his own recollections, and ask himself whether in youth he did not often say and do utterly irrational things. If he never did, he never was really young. I hardly know any author, except Shakspeare, who has ventured to reproduce, in its perfect absurdity, the full flow of youthful nonsense. The criticism of our own age would scarcely tolerate it in books, and might accuse the author himself of being silly; but the thing still exists abundantly in real life, and the wonder is that it is sometimes the most intelligent young men who enjoy the most witless nonsense of all. When we have lost the high spirits that gave it a relish, it becomes very wearisome if prolonged. Young men instinctively know that we are past the appreciation of it.