ɪn wˈʌn θˈaʊzənd sˈɛvənhˈʌndɹɪd sˈɛvənti θɹˈiː hiː pɹədˈuːst ˈɛvɪdəns fɚðə kˈɑːnsɛpt əvə sˈɛl mˈɛmbɹeɪn ɪn ɹˈɛd blˈʌd sˈɛlz haʊˈɛvɚ, ðɪs lˈæst wˈɜːk wʌz lˈɑːɹdʒli ɪɡnˈoːɹd.
In 1773 he produced evidence for the concept of a cell membrane in red blood cells – however, this last work was largely ignored.