However, as historian of science Peter J. Bowler says, "Through a combination of bold theorizing and comprehensive evaluation, Darwin came up with a concept of evolution that was unique for the time."
Namun, seperti yang sejarawan sains Peter J. Bowler katakan, "Melalui kombikasi teorisasi yang ditebalkan dan evaluasi komprehensif, Darwin memajukan konsep evolusi yang unik pada waktu itu."