Robert Hooke's drawing of cells in cork, 1665 In 1665, Robert Hooke examined a skinny slice of cork beneath his microscope, and observed a composition of tiny enclosures. He wrote "I could exceeding plainly understand it being all perforated and porous, very like a Honey-comb, but the pores of it https://g.page/r/Ccsd-yw3vSInEBM