It looks like Darwin was as impressed as everyone else by the amazing ingenuity in orchids and could not ignore the evidence for design.
Take a simple example, one that Rosenhouse finds deeply convincing and emblematic for biological evolution.
To isolate and quantify the factors which ultimately led to the acceptance of Darwinian ideas is not a straightforward task.
A less class-bound kind of protectiveness was shown to Darwin in the United States by Professor Asa Gray of Harvard University.
The theory of natural selection was the co-discovery of two men, but by the mid 1860s one of its progenitors began to reject his own theory.