A few years later, in 1687, the Italian biologists Giovanni Cosimo Bonomo and Diacinto Cestoni published that scabies is caused by the parasitic mite "Sarcoptes scabiei", marking scabies as the first disease of humans with a known microscopic causative agent. In the same publication, "Esperienze Intorno alla Generazione degl'Insetti" ("Experiences of the Generation of Insects"), Francesco Redi also described ecto- and endoparasites, illustrating ticks, the larvae of nasal flies of deer, and sheep liver fluke. His earlier (1684) book "Osservazioni intorno agli animali viventi che si trovano negli animali viventi" ("Observations on Living Animals found in Living Animals") described and illustrated over 100 parasites including the human roundworm. He noted that parasites develop from eggs, contradicting the theory of spontaneous generation.