Drawing of cork seen under a microscope; the first picture showing cells" in a biological specimen, named as such by Robert Hooke. He prepared the specimen by making thin slices with a razor blade, and thus he invented the technique of sectioning; the discovery was described to the Royal Society on 13th April 1663. This figure first appeared in his book called "Micrographia"; this contains some of the most beautiful drawings of microscope observations ever made. Hooke was an English physicist born in 1635. His main accomplishments were in the fields of physics, where he studied the action of springs, and biology."