<P> The 2nd edition, published in 1803 (with Malthus now clearly identified as the author), was entitled "An Essay on the Principle of Population; or, a View of its Past and Present Effects on Human Happiness; with an enquiry into our Prospects respecting the Future Removal or Mitigation of the Evils which it occasions ." </P> <P> Malthus advised that the 2nd edition "may be considered as a new work", and essentially the subsequent editions were all minor revisions of the 2nd edition . These were published in 1806, 1807, 1817, and 1826 . </P> <P> By far the biggest change was in how the 2nd to 6th editions of the essay were structured, and the most copious and detailed evidence that Malthus presented, more than any previous such book on population . Essentially, for the first time, Malthus examined his own Principle of Population on a region - by - region basis of world population . The essay was organized in four books: </P> <Ul> <Li> Book I--Of the Checks to Population in the Less Civilized Parts of the World and in Past Times . </Li> <Li> Book II--Of the Checks To Population in the Different States of Modern Europe . </Li> <Li> Book III--Of the different Systems or Expedients which have been proposed or have prevailed in Society, as They affect the Evils arising from the Principle of Population . </Li> <Li> Book IV--Of our future Prospects respecting the Removal or Mitigation of the Evils arising from the Principle of Population . </Li> </Ul>

Thomas malthus essay on population and food supply