In this way every part of an animal's organization could be modified exactly as required, and in the very process of this modification the unmodified would die out, and thus the definite characters and the clear isolation of each new species would be explained.
The more I thought over it the more I became convinced that I had at length found the long-sought-for law of nature that solved the problem of the origin of the species.
The same evening I did this pretty fully, and on the two succeeding evenings wrote it out carefully in order to send it to Darwin by the next post, which would leave in a day or two.
I wrote a letter to him in which I said I hoped the idea would be as new to him as it was to me, and that it would supply the missing factor to explain the origin of the species. And so it was that Wallace sent a memoir about this evolutionary theory to the influential expert naturalist Charles Darwin, arrived in Darwin's hands in June 1858.
This appointment may have been the first professional post in Economics held by anyone in human history.
Other works include An Inquiry into the Nature and Progress of Rent (1815) and Principles of Political Economy (1820).Words from another Autobiography, this time one by Alfred Russel Wallace, are also available to us as evidence of the massively significant influence of Thomas Malthus Essay on the Principle of Population.It was in 1858 whilst he was laid up with a malarial fever at Ternate, in the Celebes Islands, that a possible solution to the method of evolution flashed into form in Wallace's mind.It then occurred to me that these causes or their equivalents are continually acting in the case of animals also; and as animals usually breed much more rapidly than does mankind, the destruction every year from these causes must be enormous in order to keep down the numbers of each species, since they evidently do not increase regularly from year to year, as otherwise the world would long ago have been densely crowded with those that breed most quickly.Vaguely thinking over the enormous and constant destruction which this implied, it occurred to me to ask the question, Why do some die and some live?His main contribution is to Economics where a theory, published anonymously as "An Essay on the Principle of Population" in 1798 has as a central argument that populations tend to increase faster than the supply of food available for their needs.To quote directly from the essay:- "Population, when unchecked, increases in a geometrical ratio.He was subsequently ordained as an Anglican cleric in 1797 despite having an inconvenient speech impediment.He became curate of the parish of Albury in Surrey in 1798 and held this post for a short time.This suggestion was unmistakably outrageous given the moralities of the times (and would doubtless be most controversial today).The Essay on the Principle of Population and other writings encouraged the first systematic demographic studies and also had a significant influence in several ways:- In Economics David Ricardo's, "iron law of wages" and theory of distribution of wealth contain some elements of Malthus' theory.