Re a reprinting of BR's ABC of Relativity. "As ten years have elapsed since Pirani looked at it it is just conceivable, though we hope not, that some further slight changes may be needed. We do not know whether Mr. Felix Pirani is still alive and up to date in his knowledge of relativity, but if Lord Russell so instructs we will certainly try to find out. Alternatively, Lord Russell may know someone who would glance through the book and let us know whether it is all right to reprint it as it stands."