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.
Defensio pro Populo Anglicano Defensio pro Populo Anglicano is a Latin polemic by John Milton, published in 1651. The full title in English is "John Milton an Englishman His Defence of the People of England." It was a piece of propaganda, and made political argument in support of what was at the time the government of England.