s distinct danger if we
disclose ourselves by attacking them. They may find a way to
attack us, and cause considerable damage. As things are now,
with our vanishing birth rate, we can't afford to lose
people in a war.

(4) The fourth alternative is to breed their race out of
existence by planting our blood here--in other words, an
invasion from within. This will depend upon our two races
being inter-fertile. I am almost certain that they are. If I
can stay alive for seven months longer I will give you a
definite report. I will carry on the experiment as swiftly
as possible.

Since these people have such a short life span our descendants will
live hundreds of years longer than theirs. The present race will
slowly be bred out due to the infirmities of its men. Our men and
their women will create a race superior to both.

If I can find a way to escape from the F.B.I., and establish myself
once more in safety I will try to justify Your Excellency's confidence
in your humble servant.

* * * * *

I put the letter down on my desk. It certainly told most of the story.
It needed only a final paragraph. Then I sat down at the typewriter
and added it:

I am closing now, Your Excellency. Tomorrow will be the transmission
date for this letter. I may not communicate with you again for some
time, but please understand, Excellency, that I am your humble and
devoted servant and have tried to carry on in strict accordance with
your wishes.

I put the letter into an envelope and put it in my pocket. Then I got
into my car and drove down through the city to the northwest wing of
the Department of Justice Building. The elevator girl smiled. "Haven't
seen you for a long time, Nat. Don't you work for the F.B.I. any
more?"

I smiled back at her, "The Chief has had me up to a lot of out-of-town
devilment."

I passed Jack and Tex in the hall, and we waved to each other. They
wanted to talk, but I was in too much of a hurry. "The Chief wants
me," I said, without slowing down.

When I reached the Chief's office Mrs. Sperling gave me a broad grin.
"Hello, Nat. The Chief's been waiting for you."

I went down the little corridor into the Chief's room. He was sitting
at his desk looking grim and tense. On the wall behind him was a huge
map of the United States. It had clumps of vari-colored pins all over
it. His deep voice boomed across the room.