| Date | 1854 |
| Author | Schroeder |
| Contribution | With von Dusch, reported that the development of microorganisms in sterile organic matter can be prevented by passing incoming air through cotton wool. |
| Reference | Anon. |
| Notes | The use of cotton plugs became a standard means of preventing contamination, and remains in everyday use. This was a contribution to the long Spontaneous Generation controversy that was separate from, but relevant to, the Germ Theory. |
| Category | Miscellany |
| Pathogen Class | General |
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