Who is New Generation of Naturalists from The Origin of Species and what is their importance?

Darwin looks to the upcoming, young generation of naturalists to accept his theory and expand it. He truly sees the theory of natural selection as the future of natural science and laments that the current generation of naturalists are too wedded to the old, established notions to largely accept a new one like natural selection. However, he believes, or hopes, that the new generation will be more open-minded and critical in their thought.