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A SOLAR flare in the 3+ category of importance and of exceptionally large extension was observed on June 1 at the Royal Greenwich Observatory, Herstmonceux, and at a number of other solar stations in Europe. We have recently been analysing the film in Hr:x light taken with the Lyot heliograph . at the Royal Observatory, Cape of Good Hope, which gives a complete record of the flare at 1-min. intervals under cloudless conditions.The spot group over which the flare occurred was of complex E-type containing 24 spots and had extended rapidly in area since its first appearance on the east limb on May 29. The flare began at 0823 u.T. and developed rather slowly until about