Letter from H H [Herbert Hall] Turner, University Observatory, Oxford, to [Joseph] Larmor They profited by Larmor's remark about St. Patrick's Day and had an enjoyable evening. After some brief notes, Turner asks the question if there is any critical point about aberration depending upon the velocity of a light source, giving an example of how this might be settled, and discussing the problem at length. He ought to worry this out himself, but has work, and wonders if Larmor can tell him offhandedly. 22 March 1908