After my return to England it appeared to me that by following the example of Lyell in geology, and by collecting all facts which bore in any way on the variation of animals and plants under domestication and nature, some light might perhaps be thrown on the whole subject.

We trust that he is mistaken in believing that he may count Sir C. Lyell as one of his converts.

Mr. Wallace expressed the wish that if I thought well of his essay, I should send it to Lyell for perusal.

We are informed also by Sir C. Lyell of a recent important discovery near Troyes, France.