Tim nodded. His face had grown a trifle paler. He showed no immediate anxiety to make the first advance, reserving that privilege for his comrade. A breath of wind stole out and set the dry leaves rustling.

"We must look out," he said at length. "There'll be a sign."

Uncle Felix listened attentively to every word. The boy had moved up closer to him. "And if anything happens one of us must climb a tree and signal. You've got the clean handkerchief. You see, it's at the centre that it gets rather nasty—because anybody who gets there simply disappears and is never heard of again. That's why there's no centre at all really. It's a terrible rescue we've got to do."

The adventure fulfilled the desire of his heart, for, since there was no centre, the search would last for ever.

"Keep a sharp look-out for the sign," replied the man, feeling a small hand steal into his own. "We'd better go in before it gets any darker."

"Oh, that's nothing," was the whispered comment. "The great thing is not to lose our way. Just follow me!"

They then went into this wood without a centre, without a middle, without a heart. Into this heartless wood they moved stealthily, Uncle Felix singing under his breath to keep his courage up:

"A wood is a mysterious place,
It never looks you in the face,
But stares behind you all the time.
Your safest plan is just to—climb!
For, otherwise you lose your way,
The week, the month, the time of day;
It turns you round, it makes you blind,
And in the end you lose your mind!
Avoid the centre,
If you enter!

"It grows upon you—grows immense,
Its peace is not indifference,
It sees you—and it takes offence,
It knows you're interfering.
Its sleepliness is all pretence,
With trunks and twigs and foliage dense
It's watching you, alert, intense,
It's furious; it's peering.

"Upon the darkening paths below,
Whichever way you try to go
You'll meet with strange resistance.
So climb a tree and wave your hand,
The birds will see and understand,
And may bring you assistance.
Avoid the centre,
If you enter,
For once you're there
You—disappear!
Smothered by depth and distance!"