Letter from Thomas Gold to Professor J W S Pringle, FRS, Department of Zoology, Oxford University, Oxford, United Kingdom Says that he is interested, 'mainly for space purposes, in various remotely controlled machinery. I recall that you told me something of the simple mechanisms employed in the walking of a cockroach'. Asks if Professor Pringle worked on that. He has not found a paper that explains just that and asks if Professor Pringle can give him the information. 20 December 1966