"As Pearson later remembered, “The very notion that the Darwinian theory might after all be capable of statistical demonstration seemed to excite all sorts and conditions of men to hostility. Weldon, instead of being allowed to do his own work in his own way, had to be constantly replying to letters, some even 18 sheets long … These letters were not sympathetic and suggestive, but mostly purely controversial,” [1]."

https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1010379