Law of Population was a treatise written  as a response to works on population growth by an English cleric and what?
Law of Population Law of Population (1830) was a massive treatise written by Michael Thomas Sadler as a response to Thomas Robert Malthus's works on population growth, notably "An Essay on the Principle of Population" (first edition 1798). In his essay, Sadler refutes Malthus' conclusions regarding the geometric growth of populations and proposes that the growth of populations is a far less worrisome menace. At this period population growth had become a "political bugbear" throughout England, much in a way comparable to modern day fears of terrorism or Cold War fears of nuclear war.
Richard Rolle Richard Rolle (1290/1300– late September 1349) was an English hermit, mystic, and religious writer. He is also known as Richard Rolle of Hampole or de Hampole, since at the end of his life he lived near a Cistercian nunnery in Hampole, Yorkshire. In the words of Nicholas Watson, scholarly research has shown that "[d]uring the fifteenth century he was one of the most widely read of English writers, whose works survive in nearly four hundred English...and at least seventy Continental manuscripts, almost all written between 1390 and 1500."