The main idea of the biogenesis theory is that all living things arrived from other living things. This theory of microbiology was formulated by Louis Pasteur. The theory of biogenesis was discovered when Mr. Pasteur was trying to prove the then current theory of spontaneous generation wrong. Pasteur proved with his experiments that microorganisms lived in the air. For more information go to
. www. brighthub.com/science/medial/articles/21169.aspx.