As gametes (male sperm and female ova) were too small to be seen under the best magnification at the time, Harvey's account of fertilization was theoretical rather than descriptive.
Karena gamet (sperma laki-laki dan sel telur betina) terlalu kecil untuk dilihat di bawah perbesaran terbaik pada saat itu, perhitungan pembuahan Harvey lebih bersifat teoritis daripada deskriptif.