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Addressee
- 'My dear Sir'1
- , Dr. Lawson1
- , Editor of The Athenaeum2
- , Editor of the Phil. Mag.1
- , Editor of the Times4
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- , John1
- , Lady Colvile1
- , Leonard Darwin1
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- , Miss Guthrie1
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- , Unidentified1
- ?11
- Acland, H. W.1
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