of the evils which it occasions. Authorship acknowledged. 1806, 1807, 1816 and 1826: editions 3–6, with relatively minor changes from the second edition. 1823: Malthus contributed the article on Population to the supplement of the Encyclopædia Britannica. 1830: Malthus had a long extract from the 1823 article reprinted as A summary view of the Principle of Population. Other works 1800: The present high price of provisions In this work, his first published pamphlet, Malthus argues against the notion prevailing in his locale that the greed of intermediaries caused the high price of provisions. Instead, Malthus says that the high price stems from the Poor Laws, which "increase the parish allowances in proportion to the price of corn." Thus, given a limited supply, the Poor Laws force up the price of daily necessities. However, he concludes by saying that in time of scarcity such Poor Laws, by raising the price of corn more evenly, actually produce a beneficial effect. 1814: Observations on the effects of the Corn Laws Although government in Britain had regulated the prices of grain, the Corn Laws originated in 1815. At the end of the Napoleonic Wars that year, Parliament passed legislation banning the importation of foreign corn into Britain until domestic corn cost 80 shillings per quarter. The high price caused the cost of food to increase and caused distress among the working classes in the towns. It led to serious rioting in London and to the Peterloo Massacre in Manchester in 1819. In this pamphlet, printed during the parliamentary discussion, Malthus tentatively supported the free-traders. He argued that given the increasing cost of growing British corn, advantages accrued from supplementing it from cheaper foreign sources. 1820: Principles of political economy In 1820 Malthus published Principles of Political Economy. (A second edition was posthumously published in 1836.) Malthus intended this work to rival Ricardo's Principles (1817). It, and his 1827 Definitions in political economy, defended Sismondi's views on "general glut" rather than Say's Law, which in effect states "there can be no general glut". Other publications 1807. A letter to Samuel Whitbread, Esq. M.P. on his proposed Bill for the Amendment of the Poor Laws. Johnson and Hatchard, London. 1808. Spence on Commerce. Edinburgh Review 11, January, 429–448. 1808. Newneham and others on the state of Ireland. Edinburgh Review 12, July, 336–355. 1809. Newneham on the state of Ireland, Edinburgh Review 14 April, 151–170. 1811. Depreciation