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