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Redi's experimental group consisted of netting-covered jars that contained meat. The control group consisted of uncovered jars that also contained meat. The netting allowed air to enter and prevented flies from landing on the meat. After a few days, maggots were living in the meat in the open jars, but the net-covered jars remained free of maggots. Redi's experiment showed convincingly that flies come only from eggs laid by other flies. Redi's hypothesis was confirmed, and a major blow was struck against the hypothesis of spontaneous generation.

figure 14-2

In Spallanzani's experiment, he boiled meat broth in open flasks. Then, he sealed the flasks of the experimental group by melting the glass necks of the flasks closed. The broth inside remained uncontaminated by microorganisms.

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