My dear Darwin,--I have delayed writing to thank you for your book on Worms till I had been able to read it, which I have now done with great pleasure and profit, since it has cleared up many obscure points as to the apparent sinking or burying of objects on the surface and the universal covering up of old buildings. I have hitherto looked upon them chiefly from the gardener's point of view--as a nuisance, but I shall tolerate their presence in the view of their utility and importance. A friend here to whom I am going to lend your book tells me that an agriculturist who had been in West Australia, near Swan River, told him many years ago of the hopelessness of farming there, illustrating the poverty and dryness of the soil by saying, "There are no worms in the ground." I do not see that you refer to the formation of leaf-mould by the mere decay of leaves, etc. In favourable places many inches or even feet of this is formed--I presume without the agency of worms. If so, would it not take part in the formation of all mould? and also the decay of the roots of grasses and of all annual plants, or do you suppose that _all_ these are devoured by worms? In reading the book I have not noticed a single erratum. I enclose you a copy of two letters to the _Mark Lane Express_, written at the request of the editor, and which will show you the direction in which I am now working, and in which I hope to do a little good.--Believe me yours very faithfully, ALFRED R. WALLACE. FOOTNOTES: [1] "While at Hertford I lived altogether in five different houses, and in three of these the Silk family lived next door to us, which involved not only each family having to move about the same time, but also that two houses adjoining each other should have been vacant together, and that they should have been of the size required by each, which after the first was not the same, the Silk family being much the larger."--"My Life," i. 32. [2] "My Life," i. 191-2. [3] "My Life," i. 108-111. [4] Darwin makes a similar comment: "I was very successful in collecting, and invented two new methods ... and thus I got some very rare species. No poet ever felt more delighted at seeing his first poem published than I did at seeing, in Stephens' 'Illustrations of British Insects,' the magic words, 'captured by C. Darwin, Esq.'"--Darwin's Autobiography, in the one-volume "Life," p. 20. [5] "My Life," i. 194-5. [6] There is no record in his autobiography as to the exact date when he first became acquainted with Lyell's work, though several times reference is made to it. [7] "Travels on the Amazon," p. 277. [8] "Voyage of the _Beagle_," pp. 11-12. [9] "Voyage of the _Beagle_," p. 534. [10] It is interesting to note that the careers of Sir Joseph Hooker, Charles Darwin, H.W. Bates, Alfred Russel Wallace and T.H. Huxley were all determined by voyages or journeys of exploration. [11] "Life of Charles Darwin" (one-volume Edit.), p. 29. [12] "Voyage of the _Beagle_," p. 535.