New book series and magazines were founded in the 1870s and helped to publicize evolutionism. Many popular accounts focused on the ascent of life, still portraying it as a linear development toward humanity. They often used living rather than fossil species to characterize the main stages in the ascent, and stressed the parallel with the development of the embryo (the recapitulation theory). A few key fossils were discovered to boost the case for evolution, including the ancestry of the horse. Both Darwinians and the supporters of Herbert Spencer’s philosophy exploited the technique of the ‘evolutionary epic’ to make their case. But so did the promoters of rival explanations, including the Lamarckians and those who saw progress as the unfolding of a divine plan. Darwinism remained a source of controversy, and the opposition began to increase toward the end of the nineteenth century.