Dave pointed to the "Yes" with the crystal.

"You can see me?"

Again came the point. And Jane hurriedly wrapped herself in the sheet and blushed. Then she threw away the sheet and said. "It seems that this is no time for modesty, Dave."

He tapped the printed "Yes" once again as Jane reached for her dressing gown and slipped into it.

"What do you want?" she asked.

Carbon paper, he wrote on the wall.

Jane disappeared, and Dave smiled at the scribbling on the wall. Its disjointed message was bearing fruit. But what could one make out of:

Jane. This is Dave!

Yes!

Carbon paper.

Nothing but the safety of America!

Instead of carbon paper, Jane brought a "Magic Slate", one of those wax-based tablets covered with a celluloid sheet that can be written on with a stylus and then erased by lifting the celluloid. It was better than carbon paper, and Dave cheered to himself at her brain-work.

"What is that?" she asked.

This crystal is the one the enemy was bringing to Merion Laboratory to replace the one they blew up in the safety-dump yesterday, he wrote.

"Where are you?"

I am in some sort of interspace between time quanta. Your guess is better than mine.

"Who is the enemy?"

Dave wrote it out, and then added the rest of the details.

"What shall I do?"

Stop them—somehow.

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