Just out of curiosity, do you have a link to a source for that?
If you can get hold of it. My copy has disappeared so I am depending on my memory. I will look for something more accessible. But the title reminds me that pupular acceptace of his theory by the educated public came before acceptance by scientists. One reason was that the age of the world was thought to be only tens of millions of years, certainly not enough time for a trial and error process to work itself out.
The Descent of Darwin: Popularization of Darwinism in Germany, 1860-1914 by Alfred Kelly
Review author[s]: Ruth Rinard
German Quarterly, Vol. 55, No. 1 (Jan., 1982), pp. 133-134
doi:10.2307/405620
BTW, Kelly has a web site. You can e-mail him directly and ask him. I may be all wet about his opinion.