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.
Ancient constitution of England The ancient constitution of England was a 17th-century political theory about the common law, used at the time in particular to oppose the royal prerogative. It was developed initially by Sir Edward Coke, in his law reports; and has been analysed in modern times by J. G. A. Pocock in "The Ancient Constitution and the Feudal Law" (1st edition 1957; reissued "with a retrospect" 1987).