“Engels had read The Origin of Species and wrote to Marx about the book in December of 1859. Engels praised Darwin for his theoretical triumph over teleology in the organic sciences, but at the same time also cautioned Marx against Darwin’s ‘clumsy’ style and apparent lack of sophistication in philosophical matters.2 The following year, Marx himself read Darwin’s book, whereupon he immediately accepted the theory of natural selection as a scientific confirmation of his own ideas about human history. Darwin’s theory, he felt, with its emphasis on struggle and evolution in the natural world, was the perfect complement to his own theory of class struggle and historical development. Writing to Ferdinand Lassalle in January, 1861, Marx explained that ‘Darwin’s book is very important and serves me as a basis in natural science for the class struggle in history.’ Of course, he added, echoing Engels’ comments of the previous year, ‘one [had] to put up with the crude English method of development.”