Portrait of <a href="https://en.wikipedia.org/wiki/Antoni_van_Leeuwenhoek" class="extiw" title="en:Antoni van Leeuwenhoek">Antoni van Leeuwenhoek</a> (1632—1723).
<a href="https://en.wikipedia.org/wiki/Jan_Verkolje" class="extiw" title="en:Jan Verkolje">Jan Verkolje</a> (1650—1693)
1686
<a rel="nofollow" class="external free" href="http://ihm.nlm.nih.gov/images/B16786">http://ihm.nlm.nih.gov/images/B16786</a>