THE LATE SIR ROBERT BALL.
[To THI EDITOR Or rat ..Sr8CTATOIL'l
am collecting the letters of any father, the late Sir Robert Ball, LL.D., F.R.S., which I hope to publish to- gether with his "Reminiscences." Possibly some of your numerous readers have preserved interesting letters from, or relating to, him. I should be very grateful for the lean of any such letters. If sent to me, they will be carefully con. eidered and returned with the least possible delay.—I am,