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Weir, J. J. in author 
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Showing 19 of 9 items

From:
John Jenner Weir
To:
Charles Robert Darwin
Date:
17 Mar 1870
Source of text:
DAR 181: 81
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.

Contributor:
Darwin Correspondence Project
From:
John Jenner Weir
To:
Charles Robert Darwin
Date:
27 June 1870
Source of text:
DAR 181: 82
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.

Contributor:
Darwin Correspondence Project
From:
John Jenner Weir
To:
Charles Robert Darwin
Date:
4 July 1870
Source of text:
DAR 181: 83
Summary:

On mutations in rabbits.

Cytisus case is not a double graft.

Aggressive behaviour of birds of prey.

Contributor:
Darwin Correspondence Project
From:
John Jenner Weir
To:
Charles Robert Darwin
Date:
31 July 1872
Source of text:
DAR 181: 84
Summary:

On variegated leaves; a feature not inherited consistently.

Contributor:
Darwin Correspondence Project
From:
John Jenner Weir
To:
Charles Robert Darwin
Date:
14 Aug 1872
Source of text:
DAR 88: 177–8
Summary:

Hostility of birds toward others with same colour;

nuptial plumage.

Spiza cyanea and Spiza ciris.

Contributor:
Darwin Correspondence Project
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From:
John Jenner Weir
To:
Charles Robert Darwin
Date:
13 Nov 1873
Source of text:
DAR 88: 179–80
Summary:

Hybrid Motacilla.

Case of female duck leaving mate to pair with male of another species.

Contributor:
Darwin Correspondence Project
thumbnail
From:
John Jenner Weir
To:
Charles Robert Darwin
Date:
6 July 1875
Source of text:
DAR 181: 85
Summary:

Yellow flowers occurring on a purple Cytisus grafted onto a yellow stock.

Contributor:
Darwin Correspondence Project
From:
John Jenner Weir
To:
Charles Robert Darwin
Date:
7 July 1875
Source of text:
DAR 181: 86
Summary:

Yellow and purple flowers occur on plant grafted with Cytisus purpureus, but only on separate racemes. Only yellow blooms seed.

Contributor:
Darwin Correspondence Project
From:
John Jenner Weir
To:
Charles Robert Darwin
Date:
9 July 1875
Source of text:
DAR 181: 87
Summary:

Sends CD some of the Cytisus, which has produced yellow flowers on a purple graft.

Contributor:
Darwin Correspondence Project