Any one can see it who will simply read “Grimm’s Fairy Tales” or the fine collections of Mr. Andrew Lang.  For the pleasure of pedantry I will call it the Doctrine of Conditional Joy.  Touchstone talked of much virtue in an “if”; according to elfin ethics all virtue is in an “if.”  The note of the fairy utterance always is, “You may live in a palace of gold and sapphire, if you do not say the word ‘cow’”; or “You may live happily with the King’s daughter, if you do not show her an onion.”  The vision always hangs upon a veto.  All the dizzy and colossal things conceded depend upon one small thing withheld.  All the wild and whirling things that are let loose depend upon one thing that is forbidden.  Mr. W.B.  Yeats, in his exquisite and piercing elfin poetry, describes the elves as lawless; they plunge in innocent anarchy on the unbridled horses of the air—­

    “Ride on the crest of the dishevelled tide,
    And dance upon the mountains like a flame.”

It is a dreadful thing to say that Mr. W.B.  Yeats does not understand fairyland.  But I do say it.  He is an ironical Irishman, full of intellectual reactions.  He is not stupid enough to understand fairyland.  Fairies prefer people of the yokel type like myself; people who gape and grin and do as they are told.  Mr. Yeats reads into elfland all the righteous insurrection of his own race.  But the lawlessness of Ireland is a Christian lawlessness, founded on reason and justice.  The Fenian is rebelling against something he understands only too well; but the true citizen of fairyland is obeying something that he does not understand at all.  In the fairy tale an incomprehensible happiness rests upon an incomprehensible condition.  A box is opened, and all evils fly out.  A word is forgotten, and cities perish.  A lamp is lit, and love flies away.  A flower is plucked, and human lives are forfeited.  An apple is eaten, and the hope of God is gone.

This is the tone of fairy tales, and it is certainly not lawlessness or even liberty, though men under a mean modern tyranny may think it liberty by comparison.  People out of Portland Gaol might think Fleet Street free; but closer study will prove that both fairies and journalists are the slaves of duty.  Fairy godmothers seem at least as strict as other godmothers.  Cinderella received a coach out of Wonderland and a coachman out of nowhere, but she received a command—­which might have come out of Brixton—­that she should be back by twelve.  Also, she had a glass slipper; and it cannot be a coincidence that glass is so common a substance in folk-lore.  This princess lives in a glass castle, that princess on a glass hill; this one sees all things in a mirror; they may all live in glass houses if they will not throw stones.  For this thin glitter of glass everywhere is the expression of the fact that the happiness is bright but brittle, like the substance most easily smashed by a housemaid or a cat.  And this fairy-tale sentiment also sank into me and became my sentiment towards the whole world.  I felt and feel that life itself is as bright as the diamond, but as brittle as the window-pane; and when the heavens were compared to the terrible crystal I can remember a shudder.  I was afraid that God would drop the cosmos with a crash.