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From John Jenner Weir   17 March 1870

Summary

Describes the unusual appearance of a horse whose mother had previously borne a foal by a quagga. The effect of one mating on the subsequent pregnancy of another mating is explained by JJW using Pangenesis.

Author:  John Jenner Weir
Addressee:  Charles Robert Darwin
Date:  17 Mar 1870
Classmark:  DAR 181: 81
Letter no:  DCP-LETT-7137

To J. J. Weir   17 March [1870]

Summary

CD thinks JJW’s account [in 7137] is significant for a theory of generation and should go to some scientific society; suggests additional data is needed. Quotes cases of subsequent progeny apparently affected by a previous impregnation. Perhaps not prudent to allude to "despised" Pangenesis, which CD fully believes will have its day.

Author:  Charles Robert Darwin
Addressee:  John Jenner Weir
Date:  17 Mar [1870]
Classmark:  American Philosophical Society (Mss.B.D25.)
Letter no:  DCP-LETT-7138

To J. J. Weir   14 June [1870]

Summary

Asks about birds erecting feathers when enraged or frightened. Interested in examples of expression in birds and animals.

Tells of the sheldrake dancing on tidal sands to make worms come out.

Author:  Charles Robert Darwin
Addressee:  John Jenner Weir
Date:  14 June [1870]
Classmark:  University of Redlands, Armacost Library
Letter no:  DCP-LETT-7231

From J. J. Weir   27 June 1870

Summary

On behaviour of birds when frightened and when threatening.

Purple Cytisus grafted onto yellow stock produces some yellow flowers.

Mutations in rabbits.

Cites case of variegated leaf form of one plant apparently spreading to a neighbour.

Author:  John Jenner Weir
Addressee:  Charles Robert Darwin
Date:  27 June 1870
Classmark:  DAR 181: 82
Letter no:  DCP-LETT-7247

To J. J. Weir   29 June [1870]

Summary

On birds erecting feathers.

Comments on production of buds in Cytisus.

Discusses case of rabbit-breeding which affected subsequent progeny of female.

Author:  Charles Robert Darwin
Addressee:  John Jenner Weir
Date:  29 June [1870]
Classmark:  DAR 148: 327
Letter no:  DCP-LETT-7253

From J. J. Weir   4 July 1870

Summary

On mutations in rabbits.

Cytisus case is not a double graft.

Aggressive behaviour of birds of prey.

Author:  John Jenner Weir
Addressee:  Charles Robert Darwin
Date:  4 July 1870
Classmark:  DAR 181: 83
Letter no:  DCP-LETT-7264
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