Ɛpsilon

To John Bush   2 April [1868]1

Down. | Bromley. | Kent. S.E.

Ap 2

Dear Sir

I am much obliged to you for your kindness in giving me all the information in your power. Should you ever find the memorandum to which you refer I shd be particularly obliged for fuller details.2

I have heard of analogous cases to that which you relate about crossing rats.3 I have indeed seen it positively stated that if white & grey mice are crossed, the offspring is of either of these colours & never pie-bald.

With my best thanks | I remain dear Sir | yours very faithfully | Ch. Darwin

LS

1
The year is established by the relationship between this letter and the letter from John Bush, 30 March 1868.
2
In his letter of 30 March 1868, Bush indicated that he had lost some notes on the exact proportions of the sexes in litters of rats; CD had asked for the information in his letter to Bush of 29 February [1868].

Please cite as “DCP-LETT-6084,” in Ɛpsilon: The Charles Darwin Collection accessed on 5 June 2025, https://epsilon.ac.uk/view/dcp-data/letters/DCP-LETT-6084