hɪz kˈɑːpli wˈɜːk kˈeɪm wɛn hiː ʃˈoʊd ðɪ ɛɡzˈɪstəns ʌv lˈɪmf vˈɛsəlz ɪn ˈænɪməlz ænd ɛksplˈeɪnd ðɛɹ fˈʌŋkʃən baɪ haɪpˈɑːθəsˌaɪzɪŋ ðɪ ɛɡzˈɪstəns əvə hjˈuːmən lɪmfˈæɾɪk sˈɪstəm.
His Copley work came when he showed the existence of lymph vessels in animals and explained their function by hypothesizing the existence of a human lymphatic system.