 Much of the information came from older works; Gessner restated the work of Pliny the Elder and Aristotle while mixing old knowledge of the natural history of insects with his own observations.With the invention of the Microscope in 1599 came a new way of observing the small creatures that fall under the umbrella of invertebrate.Robert Hooke, who worked out of the Royal Society in England, conducted observation of insects—including some of their larval forms—and other invertebrates, such as ticks.