| Date | 1878 |
| Author | Stephenson |
| Contribution | Published proposal for homogeneous immersion. |
| Reference | Ford |
| Notes | This meant filling the space between the front lens of the objective and the cover glass with a liquid having the same refractive index as the cover glass. See 1873, 1879. It is possible that he knew of the Tolles lens, according to Ford. |
| Category | Microscopy |
| Pathogen Class | General |
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