He welcomed the distinguished elderly naturalist and geologist Heinrich Georg Bronn, but the German translation published in 1860 imposed Bronn's own ideas, adding controversial themes that Darwin had deliberately omitted. Bronn translated "favoured races" as "perfected races", and added essays on issues including the origin of life, as well as a final chapter on religious implications partly inspired by Bronn's adherence to Naturphilosophie.
What did Bronn do in his translation that went completely against what Darwin wanted in On the Origin of Species?
the German translation published in 1860 imposed Bronn's own ideas, adding controversial themes that Darwin had deliberately omitted.