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To John Bush   29 February [1868]

Summary

Writes at Frank Buckland’s suggestion. Can JB provide any information on the proportion of sexes in rats?

Do male rats fight for the possession of the female? Are they polygamous?

Author:  Charles Robert Darwin
Addressee:  John Bush
Date:  29 Feb [1868]
Classmark:  Private collection
Letter no:  DCP-LETT-5961

From John Bush   30 March 1868

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Summary

His impression is that male rats outnumber females. Males are pugnacious and polygamous. Gives details of the inheritance of colour in a colony he kept.

Author:  John Bush
Addressee:  Charles Robert Darwin
Date:  30 Mar 1868
Classmark:  DAR 83: 161-2
Letter no:  DCP-LETT-6072

To John Bush   2 April [1868]

Summary

Thanks JB for his information. Has heard of analogous cases to JB’s observations on [colours of] crossed rats; the offspring of white and grey mice are stated to be either white or grey and never piebald.

Author:  Charles Robert Darwin
Addressee:  John Bush
Date:  2 Apr [1868]
Classmark:  Private collection
Letter no:  DCP-LETT-6084
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letter (3)
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1868 (3)
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