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From John Tyndall   23 February [1871]

Summary

Has devised a respirator for firemen by moistening cotton wool with glycerine and adding charcoal. JT suggests the nose with its hairs and mucus is a respirator that would give protection against diseases caused by floating particles. The presence of hair and mucus is thus explained by CD’s theory.

Author:  John Tyndall
Addressee:  Charles Robert Darwin
Date:  23 Feb [1871]
Classmark:  DAR 106: C5–6
Letter no:  DCP-LETT-7508

To John Tyndall   [27 February 1871]

Summary

Thinks JT’s discovery of a glycerine respirator is an interesting practical discovery. CD has been wondering about the hairs in our nostrils, but doubts that JT has explained their function, since there are hardly enough.

Will ask W. Ogle to observe hairs in nostrils of different races.

Author:  Charles Robert Darwin
Addressee:  John Tyndall
Date:  [27 Feb 1871]
Classmark:  DAR 261.8: 7 (EH 88205945)
Letter no:  DCP-LETT-7518

To John Tyndall   1 March [1871]

Summary

Ogle will keep JT’s suggestion in mind in observing less hairy races of man and the lower animals.

Asks JT whether he can help Ogle on a troublesome point on the colour of tissues with olfactory nerves, and the relation of colour to the absorption of odours. Does JT’s respirator deprive odorous substances of their smell?

Author:  Charles Robert Darwin
Addressee:  John Tyndall
Date:  1 Mar [1871]
Classmark:  DAR 261.8: 8 (EH 88205946)
Letter no:  DCP-LETT-7524

To John Tyndall   1 March [1871]

Summary

Ogle is unacquainted with JT; would be proud and pleased to call on him. CD likes what little he has seen of him.

Author:  Charles Robert Darwin
Addressee:  John Tyndall
Date:  1 Mar [1871]
Classmark:  DAR 261.8: 9 (EH 88205947)
Letter no:  DCP-LETT-7525

From John Tyndall   1 March [1871]

Summary

JT suggests that Ogle call upon him so that they can arrange experiments suitable for his purpose.

Author:  John Tyndall
Addressee:  Charles Robert Darwin
Date:  1 Mar [1871]
Classmark:  DAR 106: C7
Letter no:  DCP-LETT-7527

To John Tyndall   7 March [1871]

Summary

Ogle wants very much to meet JT.

Author:  Charles Robert Darwin
Addressee:  John Tyndall
Date:  7 Mar [1871]
Classmark:  DAR 261.8: 10 (EH 88205948)
Letter no:  DCP-LETT-7552

To John Tyndall   8 March [1871]

Summary

Thanks JT for his kindness to Ogle.

Author:  Charles Robert Darwin
Addressee:  John Tyndall
Date:  8 Mar [1871]
Classmark:  DAR 261.8: 11 (EH 88205949)
Letter no:  DCP-LETT-7554

From John Tyndall   8 March [1871]

Summary

Has seen Ogle. His subject [olfactory nerve tissue and absorption of odours] has often occupied JT’s attention.

Author:  John Tyndall
Addressee:  Charles Robert Darwin
Date:  8 Mar [1871]
Classmark:  DAR 106: C8
Letter no:  DCP-LETT-7556
Document type
letter[X]
Addressee
Correspondent
Date
1871
02 (2)
03 (6)