Mr. Wallace's second paper, which in my judgment is the clearest and best condensed statement of the Doctrine of the Struggle for Existence and the principle of Natural Selection ever written, was written by Mr. Wallace at Ternate in the Malay Archipelago, in February, 1858, and sent to Mr. Darwin. It was called "On the Tendency of Varieties to Depart Indefinitely from the Original Type." Mr. Wallace requested Mr. Darwin to show it to Sir Chas. Lyell, the father of Modern Geology, and accordingly Dr. Hooker, the great botanist, brought it to Sir Chas. Lyell. They were both so struck with the complete agreement of the conclusions of Mr. Darwin and Mr. Wallace that they thought it would be unfair to publish one without the other, so this paper and a chapter from Darwin's unpublished manuscript of the "Origin of Species" were read before the Linnaean Society on the same evening and published in their Proceedings for 1858, and thus appeared in the same year, 1859, as Marx's Critique of Political Economy. This theory of Natural Selection is, you know, in brief, that more animals of every kind are born than can possibly survive, than can possibly get a living. This gives rise to a Battle for Life. In this battle those are the victors who are the best able to secure food for themselves and their offspring and are best able by fight or flight to protect themselves from their enemies. This is called the Law of the Survival of the Fittest, but remember, the Fittest are not always the best or most highly developed forms, but simply those forms best suited to the then existing environment. These two extremely interesting papers of Wallace are printed as the two first chapters of his book "Natural Selection and Tropical Nature," published by MacMillan, a book so fascinating I would beg all my hearers and readers who have not read it to do so. This law of double or multiple discovery holds good of all great discoveries and inventions, and is notably true of the first of the three great thoughts that we ordinarily associate with the name of Karl Marx. These three are: 1. The Materialistic Conception of History. 2. The Law of Surplus Value. 3. The Class Struggle--the third being a necessary consequence of the first two. Now the Materialistic Conception of History was independently discovered by Engels just as Darwinism was by Wallace, as you will see by reading Engels' preface to the Communist Manifesto. But just as Wallace gave Darwin all the credit, so Engels did to Marx. FOOTNOTE: [1] This essay was originally prepared for and delivered as a Lecture before the Young Mens' Socialist Literary Society, an organization of Jewish Socialists on the lower East Side of New York city, in the early part of the winter of 1899-1900. I THE MATERIALISTIC CONCEPTION OF HISTORY