'A Discourse to the Royall Society' made by William Petty Topics covered: - 'Wherein Duplicate and Subduplicate Ratio or Proportion is consderable' - 'Strength of Timber' - 'In the Oars of a Boate etc' - 'In the Motion of horses' - 'In Mills' - 'In Gunpowder' - 'Of Sounds' - 'Of Smells' - 'Concerns Visible Objects' - 'Of Fire and Spirits' - ' Of Rising & Falling bodies; but particularly of Waters in Pumps and River Streames' - 'In the Blast of Bellows' - 'In the Price of severall Comodities' - 'In Mill Dams, Sea Bancks and Bulwarks of Fortresses' - 'In the Compression of yielding and Elastic Bodies as Wooll' - 'Of Elasticity' 26 November 1674