Analysing the works of social theorists such as Herbert Spencer, Alfred Russell Wallace, Ernst Haeckel, and Alfred Schäffle, as well as Darwin’s own work, Dr Hermans concludes that, although not a homogeneous ideology, different versions of social Darwinism all centred around the general notion that modern society could not, in the long run, disrupt natural selection without grave consequences.
International Review of Social History, vol. 51, 2006

… a fine thesis …
Paul Schnabel, NRC Handelsblad, 24 January, 2009

Historian Cor Hermans has written a fascinating and highly readable, though rather sizeable, book on social Darwinian thought as it developed from the second half of the nineteenth century onward, mainly under the influence of the work of Darwin himself.
Paul Schnabel, NRC Handelsblad, 1-2 November, 2003