Kathleen. I've lost some; here are the rest in my pocket, if I can only get them out.
L. You mean to get them out some day, I suppose; so try now. I want them.
(Kathleen empties her pocket on the floor. The beads disperse. The School disperses also. Second Interlude—hunting piece.)
L. (after waiting patiently for a quarter of an hour, to Isabel, who comes up from under the table with her hair all about her ears, and the last findable beads in her hand). Mice are useful little things sometimes. Now, mousie, I want all those beads crystallised. How many ways are there of putting them in order?
Isabel. Well, first one would string them, I suppose?
L. Yes, that's the first way. You cannot string ultimate atoms; but you can put them in a row, and then they fasten themselves together, somehow, into a long rod or needle. We will call these 'Needle-crystals.' What would be the next way?
Isabel. I suppose, as we are to get together in the playground, when it stops raining, in different shapes?
L. Yes; put the beads together, then, in the simplest form you can, to begin with. Put them into a square, and pack them close.
Isabel (after careful endeavour). I can't get them closer.
L. That will do. Now you may see, beforehand, that if you try to throw yourselves into square in this confused way, you will never know your places; so you had better consider every square as made of rods, put side by side. Take four beads of equal size, first, Isabel; put them into a little square. That, you may consider as made up of two rods of two beads each. Then you can make a square a size larger, out of three rods of three. Then the next square may be a size larger. How many rods, Lily?