She looked up and said, “I had written him saying that I wanted a pony for Christmas.”

“Your mother?” Mason asked.

“She died when I was six, just before Dad went to China.”

“Go ahead.”

She turned back to the letter and read, “ ‘I have a very fine business here now, but I can’t tell you what it is. I have a partner. His name is Karr. Don’t you think that is a funny way for a man to spell his name? But he is a good partner, and he has lots of courage. Three weeks ago we were on a trip up the Yangtze River, and the boat he was in tipped over. Some of the Chinese boatmen clung to the overturned boat, but one of them was swept away. The current was very swift. This man couldn’t swim. He was only a Chinese, and over here the life of a laborer is not very valuable. I doubt if any one of the Chinese would have tried to rescue him, even if they had been strong swimmers. But my partner, Karr, swam out to the aid of this Chinaboy and brought him back to the boat. By that time my boat had come alongside, and the coolies managed to get it turned right side up. But we lost a lot of things in the river which we never recovered.

“ ‘The water of this river is very yellow. It is filled with a kind of mud. Even after it flows out into the ocean, it stains the whole region around the mouth of the river. It is a very big river, and Shanghai is on a branch of it called the Whangpoo.

“ ‘Shanghai is a very big city. You would never dream of the noise and bustle of one of these Chinese cities. It seems as though everyone is always screaming something at the top of his voice. You wouldn’t believe people could make that much noise.

“ ‘Now daddy wants Doris to be a good little girl, and study hard in school. Your daddy is sorry he couldn’t send you that pony for Christmas, because there is no way of sending a pony from China to the United States, but some day soon when your daddy comes back, you shall have your pony. Lots of love from a lonely father to his little girl. Your loving DAD. P.S. When you write me over here, you can write the letter addressed to me, but be sure you put it care of Dow Tucker and send it care of the American Express Company. I will get it all right.’ ”

She folded the letter, held it for a moment in her fingers as though contemplating whether she should pass it over to Mason for his inspection. Then abruptly she pushed it back into the envelope, and said simply, “I saved that one because it was the last letter I ever received. There were other letters, and I lost them. This one I kept. I never heard any more from him. I didn’t know what had happened to him.”

Wenston tried to keep from seeming impressed. “You have something else? Some better proof, perhaps?”