By the time we got home I was pretty well satisfied that if all should go well I could easily sail over the Tower in the dark.

Then I had a talk with my wife, and gave her full instructions: "When we arrive over the Tower," I said, "I shall lower you with a long rope.

You will have a parcel of food and spirit for your father in case he is fatigued or faint; and, of course, the bullet-proof suit, which he must put on at once.

You will also have a short rope with a belt at either end--one for your father, the other for you.

When I turn the aeroplane and come back again, you will have ready the ring which lies midway between the belts.