Without denying the great significance of popular rhymes to the student of folklore, we must look elsewhere for any practical suggestion for the teacher in the matter of arrangement. Such a suggestion will be found in the late Charles Welsh's _Book of Nursery Rhymes_, a little volume that every teacher interested in children's literature must make use of. The rhymes are grouped into three main divisions: (1) Mother Play, (2) Mother Stories, and (3) Child Play, with subordinate groupings under each. About 250 rhymes are included in Welsh's collection, and the arrangement suggests the best order for using them practically, without dropping into any ironclad system. It may be argued that any attempt at classification of material so freely and variously used as the Mother Goose rhymes is sure to stiffen the work of the class and render it less enjoyable. Spontaneity is more vital here than at any other stage of one's literary education. _What is the secret of the nursery rhyme's appeal to children?_ Here at least we are face to face with what may be called a final fact, that these jingles do make an appeal so universal and remarkable that any attempt to explain it seems always to fall far short of completeness. Perhaps the best start may be made with Mr. Welsh's suggestion that this appeal is threefold: first, that which comes from the rhyming jingle, as in "Higgledy, piggledy, my fat hen"; second, that which comes from the nonsense surprises, as in "Hey diddle diddle," "Three wise men of Gotham," and "I'll tell you a story"; third, that which comes from the dramatic action, as in "Little Miss Muffet," and "Little Jack Horner." This summary does not differ much from Mr. Walter Taylor Field's conclusions: "The child takes little thought as to what _any_ of these verses mean. There are perhaps four elements in them that appeal to him,--first, the jingle, and with it that peculiar cadence which modern writers of children's poetry strive in vain to imitate; second, the nonsense,--with just enough of sense in it to connect the nonsense with the child's thinkable world; third, the action,--for the stories are quite dramatic in their way; and fourth, the quaintness." Mr. Field also emphasizes the probable charm of mystery in the face of the unknown facts beyond the child's horizon, which appear in many of the rhymes.