An Essay On Animal Reproductions is a scientific work written by Lazzaro Spallanzani in 1769. The book is a comprehensive study of animal reproduction, covering topics such as the reproductive organs of animals, the process of fertilization, and the development of embryos. Spallanzani's research was groundbreaking at the time, as it challenged the prevailing theory that male semen contained pre-formed embryos. Instead, Spallanzani's experiments demonstrated...