Today I’m teaching a perilous topic: the eclipse of Darwinism. There was a period of several decades where you could make an honest intellectual argument against evolution, roughly from the time it was first published (1860) to the development of population genetics (say, roughly 1920). All the arguments since then are fundamentally garbage, but before then, some smart, reputable, qualified scientists did have sincere disagreements with the theory. Also there were some terrible arguments against Darwin, but I’m focusing on just the intelligent principled arguments.
One part of Darwin’s problem is that we have to admit that there were some gigantic holes in his theory — in particular, he didn’t have a good theory of inheritance. He tried to come up with one, his theory of pangenesis, which was a combination of Lamarckian and blending inheritance. It was wrong. It was also incompatible with his theory of evolution.
What I’ll be arguing, though, is that there was a greater problem than the flaws, and that was not that people were punching holes in The Origin. Good criticism is a treasured thing in science, and critical evaluation of an idea is essential to refining and improving it. Eventually, the people ripping on Darwin’s model of inheritance were going to produce a much more solid theory.
I’m going to make the somewhat controversial claim that the people who were burying evolution were the ones who were must uncritical and gung-ho about the idea — the ones who wholeheartedly embraced Darwinism, warts and all, and extended it in unproductive ways. That means that today I’m going to talk about two people who were disastrous to Darwinism while simultaneously acting as prominent cheerleaders for it.
So yeah, I’m going to rake a couple of historical figures over the coals, specifically Haeckel and Herbert Spencer. We’re going to discuss the positive claims of a couple of prominent 19th century boosters of evolution, and I’m going to make the case that their excesses were a contributing factor to the eclipse. Worse, their version of evolution was popular and persuasive and despite their rejection as good science, we’re still dealing with people who think recapitulation and “survival of the fittest” are great shorthand summaries of the principle of evolution.
The reading I’ve assigned for the week is this article, The Beauty and Violence of Ernst Haeckel’s Illustrations, which is an extremely harsh condemnation of Haeckel’s views. “Haeckel’s visions of nature were less objective depictions of life and more projected notions about the proper ‘order’ of nature,” it says. I’m telling the students to read Haeckel critically and also to regard this article skeptically. I’m hoping maybe they’ll be provoked into good, vigorous debate in the classroom, and that they’ll put together some thoughtful essays on the topic.