The greate invention of algebra: Thomas Harriot's treatise on equations, by Jacqueline A. Stedall, reviewed by J. Gray. Collected works on Benjamin Roberts and Charles Hutton, by W. Johnson, reviewed by A. McConnell. The man who changed everything—the life of James Clerk Maxwell, by Basil Mahon, reviewed by B. Pippard. 'The common purposes of life': science and society at the Royal Institution of Great Britain, ed. Frank A. J. L. James, reviewed by J. S. Rowlinson.