ult manner. "I think I'm getting somewhere, too.
You've read these books? Well, look, Dad; what's your attitude on
precognition? The ability of the human mind to exhibit real knowledge,
apart from logical inference, of future events? You think Dunne is
telling the truth about his experiences? Or that the cases in Tyrrell's
book are properly verified, and can't be explained away on the basis of
chance?"

Blake Hartley frowned. "I don't know," he confessed. "The evidence is
the sort that any court in the world would accept, if it concerned
ordinary, normal events. Especially the cases investigated by the
Society for Psychical Research: they _have_ been verified. But how can
anybody know of something that hasn't happened yet? If it hasn't
happened yet, it doesn't exist, and you can't have real knowledge of
something that has no real existence."

"Tyrrell discusses that dilemma, and doesn't dispose of it. I think I
can. If somebody has real knowledge of the future, then the future must
be available to the present mind. And if any moment other than the bare
present exists, then all time must be totally present; every moment must
be perpetually coexistent with every other moment," Allan said.

[Illustration]

"Yes. I think I see what you mean. That was Dunne's idea, wasn't it?"

"No. Dunne postulated an infinite series of time dimensions, the entire
extent of each being the bare present moment of the next. What I'm
postulating is the perpetual coexistence of every moment of time in this
dimension, just as every graduation on a yardstick exists equally with
every other graduation, but each at a different point in space."

"Well, as far as duration and sequence go, that's all right," the father
agreed. "But how about the 'Passage of Time'?"

"Well, time _does_ appear to pass. So does the landscape you see from a
moving car window. I'll suggest that both are illusions of the same
kind. We imagine time to be dynamic, because we've never viewed it from
a fixed point, but if it is totally present, then it must be static, and
in that case, we're moving through time."

"That seems all right. But what's your car window?"

"If all time is totally present, then you must exist simultaneously at
every moment along your individual life span," Allan said. "Your
physical body, and your mind, and all the thoughts contained in your
mind, each at its appropriate moment in sequence. But what is it that
exists only at the bare moment we