Malthus and Darwin - Brief piece on the influence of Malthus on Darwin's ideas. Essay on the Principle of Population - Sixth edition, searchable, of this academic work expanding on Malthus's first essay on the subject. T. Robert Malthus' Home Page - Provides Malthus's writings and commentary. Thomas Robert Malthus - A collection of works provided online by McMaster University, Canada. International Society of Malthus - Organization devoted to the principles of Thomas Malthus. The Nature of Rent - Malthus' 1815 inquiry into the nature of rent, hosted by The Avalon Project. An Essay on the Principle of Population - Malthus's 1798 essay on population and its effects on society.