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From L L Whyte, encloses an offprint "On unique arrangements of points in a sphere" which relates to what he said at the Cambridge meeting; Turing's reply says his work on biological systems dealt with a similar problem but with different law of force, which he then explains. In response to Whtye's question "what spherical arrangements possess extremal properties of any kind?", he thinks "almost every arrangement possess some external property", and explains why he thinks this.