Antoni van Leeuwenhoek's explanation in 1704 of the function of eyelids.
D000818:Animals; D005143:Eyelids / Q000502:physiology*; D005399:Fishes / Q000033:anatomy & histology; D049671:History, 18th Century; D006801:Humans; D009426:Netherlands; D014907:Whales / Q000033:anatomy & histology