I conceive that the right way to write a story for boys is to write so that it will not only interest boys but strongly interest any man who has ever been a boy. That immensely enlarges the audience.
What is it that strikes a spark of humor from a man? It is the effort to throw off, to fight back the burden of grief that is laid on each one of us. In youth we don't feel it, but as we grow to manhood we find the burden on our shoulders. Humor? It is nature's effort to harmonize conditions. The further the pendulum swings out over woe the further it is bound to swing back over mirth.
Word it as softly as you please, the spirit of patriotism is the spirit of the dog and wolf. The moment there is a misunderstanding about a boundary line or a hamper of fish or some other squalid matter, see patriotism rise, and hear him split the universe with is war-whoop. The spirit of patriotism being in its nature jealous and selfish, is just in man's line, it comes natural to him - he can live up to all its requirements to the letter; but the spirit of Christianity is not in its entirety possible to him.
Narrative should flow as flows the brook down through the hills and the leafy woodlands...a brook that never goes straight for a minute, but goes and goes briskly, sometimes ungrammatically, and sometimes fetching a horseshoe of ¾ of a mile around and at the end of the circuit flowing within a yard of the path that it traversed an hour before; but always going and always following at least one law, always loyal to that law, the law of narrative, which has no law. Nothing to do but make the trip; the how of it is not important, so that the trip is made.
Whenever he was out of luck and a little down-hearted, he would fall to mourning over the loss of a wonderful cat he used to own (for where women and children are not, men of kindly impulses take up with pets, for they must love something)