hiː ˈɔːlsoʊ dˈɛmənstɹˌeɪɾᵻd ðæt ɹˈɛd blˈʌd sˈɛlz wɜː dɪskˈɔɪd, ɹˈæðɚ ðɐn sfˈɛɹɪkəl æz hɐdbɪn pɹˈiːviəsli səpˈoʊzd baɪ ˈæntɑːn vˈæn lˈiːjuːwˌɛnhoʊk, bˌʌt ɪŋkɚɹˈɛktli aɪdˈɛntᵻfˌaɪd ðə sˈɛlz dˈɑːɹk sˈɛntɚz æz ðɛɹ nˈuːklɪi.
He also demonstrated that red blood cells were discoid, rather than spherical as had been previously supposed by Anton van Leeuwenhoek, but incorrectly identified the cells' dark centers as their nuclei.