The letter ran: "DEAR MR.

CASWALL, "I want to have a chat with you on a subject in which I believe you are interested.

Will you kindly call for me one day after lunch--say at three or four o'clock, and we can walk a little way together.

Only as far as Mercy Farm, where I want to see Lilla and Mimi Watford.

We can take a cup of tea at the Farm.