) Mice are useful little
things sometimes. Now, mousie, I want all those beads
crystallized. 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 endeavor). 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?
LILY.
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