Memoranda with reference to a statement submitted to the Council of the Royal Society by Dr Hermann Johann Phillipp Sprengel, from Frederick Augustus Abel Abel discusses Sprengel's 'discovery' of cumulative detonation of guncotton which Sprengel submitted to the Chemical Society on 1 May 1873, seven months before Abel's second memoir 'Contributions to the History of Explosive Agents' was communicated to the Royal Society (November 1873). Discusses the observation of his assistant Mr E O Brown, with respect to wet compressed guncotton detonation. 13 December 1892