Law of Population was a treatise written  as a response to works on population growth by an English cleric and what?
Thomas Robert Malthus Thomas Robert Malthus ( ; 13 February 1766 – 29 December 1834) was an English cleric and scholar, influential in the fields of political economy and demography. Malthus himself used only his middle name, Robert.
William Lambarde William Lambarde (18 October 1536 – 19 August 1601) was an English antiquarian, writer on legal subjects, and politician. He is particularly remembered as the author of "A Perambulation of Kent" (1576), the first English county history; "Eirenarcha" (1581), a widely read manual on the office and role of justice of the peace; and "Archeion" (completed c.1591, though not published until 1635), a discourse that sought to trace the Anglo-Saxon roots of English common law, prerogative and government.