structural:summarization
Discoveries

Like Robert Boyle and Nicolaas Hartsoeker, Van Leeuwenhoek was interested in dried cochineal, trying to find out if the dye came from a berry or an insect.

He studied rainwater, the seeds of oranges, worms in sheep's liver, the eye of a whale, the blood of fishes, mites, coccinellidae, the skin of elephants, Celandine, and Cinchona.