The first duty of the nursery story is to be poetic, its second to preserve the marvellous element. Therefore, it is first of all necessary that the order of the legendary world be sacred to it. What in the language of legendary lore is regarded as a fixed rule, must be respected by the nursery story, however unimportant it may be in relation to the laws and rules of the real world. Thus it is quite inappropriate for the nursery story, as in Andersen's "The Dryad," to part its heroine from her tree, to let her make a symbolic journey to Paris, to go to the "bal Mabille," etc., for it is not more impossible for all the kings of the earth to place the smallest leaf on a nettle than it is for legendary lore to tear a dryad away from its tree. But in the second place, it lies in the nature of the nursery story form that its outline can frame nothing that, in order to obtain its poetic rights, requires a profound psychological description, an earnest development, such as would be adapted either to the nature of the drama or the romance. A woman like Marie Grubbe, a sketch of whose interesting life Andersen gives us in the story of "Chicken-Grethe," is too much of a character for it to be possible for the author of the nursery story to describe or interpret; when he attempts to do so, we feel a disproportion between the object and the form.[8] There is less occasion, however, to marvel at these few blemishes than at the fact that they so very rarely occur. I have only called attention to them because it is interesting to become acquainted with the boundary lines by observing how they have been overstepped, and because it seemed to me more important to ascertain how the Pegasus of the nursery story, notwithstanding all its freedom to race and fly through the circle, has its firm tether in the centre.