BR thanks him for the copies of the advertisements of Has Man a Future? and is glad that the book has made a good start."It was kind of you to send the two reviews. I do not think Sidney Hook [New York Times Book Review, 14 Jan. 1962] worth answering. I have had long controversies with him in the past, but on the whole they seemed futile. The other review that you enclosed was very encouraging and I hope that the book will continue to sell in spite of Mr. Hook."