Spontaneous Generation
A scientist by the name of Theordor Schwann began to study cells nearly two centuries later. Schwann originally believed in a concept known as spontaneous generation. In spontaneous generation, it was believed that living things arose from non-living things. During that time period, spontaneous generation was considered to be common sense. Some examples of commonly believed spontaneous generation included that meat turned into maggots, stored grain turned into mice and mud turned into frogs. Schwann, at the time, had every reason to believe that cells were no different and that they arose from non-living things. Spontaneous generation wasn’t discredited until French microbiologist Louis Pastur performed experiments proving so. By the end of the 19th century, it had been proven, without a doubt, that cells were only capable of being formed from other cells.