To John Gould [13 April 1838]

[36 Great Marlborough Street, London.]

My dear Sir

As I do not at all like the idea of your going to Australia with no other remembrance of me, than rat traps and saddle-bags, will you do me the favour to accept the accompanying trifle, as a very slight token of my earnest wish, that your expedition may answer your & Mrs. Gould's expectations in every respect.

Very truly Yours | Chas Darwin

Good Friday

N.B. | I find in my notes that the thick-billed Synallaxis, which you doubted, whether you would not make a sand-lark, is a synallaxis in habits.— so stick to your first opinion—

To Thomas Green [after 30 June 1839]

Dear Sir

I return the proof sheets & must have revises— I am sorry I shall not be able to complete the 6 pages for a week or two to come.—

You enquire regarding Mr Walkers work, which you were good enough to call my attention to. I have found in it much which has interested me, but I cannot quite think he has established his theory.—

Believe me | Yours truly | Chas. Darwin

12 Upper Gower St | Friday

Thomas Green Esqre

To Basil Hall 15 March 1840

12 Upper Gower Street Sunday 15th March 1840

My dear Sir

I much regret, that from the state of my health I am incapable of answering your question at the length which I should much wish to do.— I forget what I said to Mr Lyell, but I remember that from your description I had expected a much larger valley. If the valley be considered as bounded by the mountains of granitic rocks its width is between 3 & 4 miles. But the width of the valley in which the river flows is only about a mile.— I have not a copy of your work, & I am unable to leave the house, but I think you have considerably overstated the distance up the valley, to which the terraces extend,— at least as far as I could discover.