_:b6455431 "1798, Thomas Malthus, chapter 2, in An Essay on the Principle of Population\u200E[1], London: J. Johnson, pages 32\u201333:"@en . _:b6455431 "Some of the objects of enquiry would be [\u2026] what was the comparative mortality among the children of the most distressed part of the community, and those who lived rather more at their ease [\u2026]"@en .