To John Tyndall   12 August [1874]¹

My dear Tyndall

The sheets have just arrived & I return them by the first post, which leaves this place in $\frac{1}{2}$ an hour.² I have read over the whole about my work, & have been most deeply gratified by what you say. As far as a rather hasty reading suffices, I have not one word of criticism to make. It all seems to me excellent, & as clear as light. I shall be most anxious to read the first & last part, as I can clearly see that the whole will interest me in the highest degree.

It is a grand subject—

In great haste | Yours very cordially | Ch. Darwin