He showed that the theory of [[spontaneous generation]] was false, by placing one piece of meat under a glass jar and another in an open dish. He observed flies landing on the exposed meat, but of course flies could not penetrate the glass jar. Flies did not come out of nothing, but from eggs deposited by flies which he could easily see landing on the exposed meat. | He showed that the theory of [[spontaneous generation]] was false, by placing one piece of meat under a glass jar and another in an open dish. He observed flies landing on the exposed meat, but of course flies could not penetrate the glass jar. Flies did not come out of nothing, but from eggs deposited by flies which he could easily see landing on the exposed meat. |