For them, the publication of Charles Darwin's On the Origin of Species was the epiphany of everything they had begun to suspect.
fɔːɹ ðˌɛm, ðə pˌʌblɪkˈeɪʃən ʌv tʃˈɑːɹlz dˈɑːɹwɪnz ɔnðɪ ˈɔːɹɪdʒˌɪn ʌv spˈiːsiːz wʌzðɪ ᵻpˈɪfəni ʌv ˈɛvɹɪθˌɪŋ ðeɪ hæd bɪɡˈʌn tə səspˈɛkt.