mˈɔːɹɡən ɹᵻdʒˈɛkts ðɪ ˈeɪdʒᵻz ʌv stˈoʊn, ʌv bɹˈɑːnz, ʌv ˈaɪɚn, ðə θɹˈiːˈeɪdʒ sˈɪstəm ʌv pɹˈiːhˈɪstɚɹi, æz bˌiːɪŋ ɪnsəfˈɪʃənt kˌæɹɪktɚɹaɪzˈeɪʃənz ʌv pɹˈɑːɡɹɛs.
Morgan rejects the Ages of Stone, of Bronze, of Iron, the Three-Age System of pre-history, as being insufficient characterizations of progress.