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There follows a selection of key letters relating to some of Wallace's greatest discoveries: evolution by natural selection; the Wallace Line; and warning colouration.
Early life (1823-1848)
WCP346: Wallace to Henry Walter Bates, 28 December 1845. Wallace discusses his views of the book Vestiges of the Natural History of Creation - the work which convinced him of the reality of evolution and started him on his quest to discover the mechanism which drives it.
WCP348: Wallace to Bates, 11 October 1847. This letter contains his famous statement "I begin to feel rather dissatisfied with a mere local collection - little is to be learnt by it. I sh[ould]d like to take some one family, to study thoroughly - principally with a view to the theory of the origin of species. By that means I am strongly of [the] opinion that some definite results might be arrived at." This was the prelude to Wallace suggesting to Bates that they go on a expedition to Brazil to collect birds, butterflies and beetles in order to try to discover what drives the evolution of new species. For more information see here.
Four year expedition to the Amazon Basin (1848-1852)
WCP349: Wallace to Richard Spruce, 19 September 1852. "On Friday the 6th of August...about 9 o'clock in the morning just after breakfast the Captain (who was the owner of the vessel) came into the cabin & said "I am afraid the ship's on fire. Come & see what you think of it"". After four years in Brazil, Wallace sailed back to England taking with him the most valuable part of the collection of natural history specimens he had made whilst there. Twenty-six days into the voyage, in the mid-Atlantic, the ship caught fire and sank, taking his specimens down with it. Wallace and the crew took to the lifeboats and miraculously, were rescued 10 days later. This letter describes the sinking.
Eight year expedition to the Malay Archipelago (1854-1862)
WCP1703: Wallace to his agent Samuel Stevens, 21 August 1856. This letter is the first mention of Wallace's famous discovery of what was later named the Wallace Line - the invisible boundary between the animals of Asia and the Australian region. He says "The Birds have however interested me much more than the insects, they are proportionally much more numerous, and throw great light on the laws of Geographical distribution of Animals in the East. The Islands of Baly & Lombock for instance, though of nearly the same size, of the same soil aspect elevation & climate and within sight of each other, yet differ considerably in their productions, and in fact belong to two quite distinct Zoological provinces, of which they form the extreme limits. As an instance I may mention the Cockatoos, a group of birds confined to Australia & the Moluccas, but quite unknown in Java Borneo Sumatra & Malacca. One species however (Plyctolophus sulphureus) is abundant in Lombock but is unknown in Baly, the island of Lombock forming the extreme eastern limit of its range & that of the whole family. Many other species illustrate the same fact & I am preparing a short account of them for publication." For more information see here.
WCP1454: Wallace to Joseph Dalton Hooker, 6 October 1858. This is the only letter which survives of those surrounding Wallace's discovery of natural selection and the subsequent publication of the theory with Charles Darwin. The letter illustrates Wallace's good nature and demonstrates that he was more interested in discovering new ideas than reaping personal glory from publishing them. For more information about the events surrounding Darwin and Wallace's joint publication on natural selection see here.
Later life in England (1862-1913)
WCP609: Charles Darwin to Wallace, 23 February 1867. Darwin and Wallace became good friends. In this letter Darwin writes "On Monday evening I called on Bates & put a difficulty before him, which he could not answer, & as on some former similar occasion, his first suggestion was, "you had better ask Wallace". My difficulty is, why are caterpillars sometimes so beautifully & artistically coloured?" Darwin was puzzled because his theory of sexual selection (where females choose their mates based on how attractive they are) would not apply to caterpillars since they are immature.
Wallace replied the next day (WCP4083) with the suggestion that since some caterpillars "...are protected by a disagreeable taste or odour, it would be a positive advantage to them never to be mistaken for any of the palatable catterpillars, because a slight wound such as would be caused by a peck of a bird's bill almost always I believe kills a growing catterpillar. Any gaudy & conspicuous colour therefore, that would plainly distinguish them from the brown & green eatable catterpillars, would enable birds to recognise them easily as at a kind not fit for food, & thus they would escape seizure which is as bad as being eaten."
Thus the concept of warning or aposematic colouration in animals was born.
WCP575: The Secretary of The Royal Society to Wallace, 6 November 1890. Informing Wallace (with unintended irony) that "... the Royal Society have awarded to you the Darwin Medal for your Independent Origination of the Theory of the Origin of Species by Natural Selection."
WCP543: The King's Private Secretary to Wallace, 2 November 1908. Informs Wallace that he is to be awarded the Order of Merit by the King "...in recognition of the great services which you have rendered to science." The Order is awarded by the ruling Monarch and is the highest civilian honour of Great Britain. It has been described as "...quite possibly, the most prestigious honour one can receive on planet Earth." There are only 24 living individuals in the Order at any given time, not including honorary appointees.
WCP4244: Wallace to the Biology Students at the University of Colorado, 12 January 1912. In this charming letter, Wallace aged 89 tells the students how "The wonders of nature have been the delight and solace of...[his]...life." and how "...nature has afforded...[him]...an ever increasing rapture, and the attempt to solve some of her myriad problems an ever-growing sense of mystery and awe". He ends by saying "I sincerely wish you all some of the delight in the mere contemplation of nature's mysteries and beauties which I have enjoyed, and still enjoy."
B) Other documents
WCP4756: Wallace's personal annotated copy of the famous scientific paper he jointly authored with Charles Darwin in 1858, in which the theory of evolution by natural selection was proposed for the first time. For more information about this historically important item see here.
WCP4766 and WCP4767: Wallace's two scientifically important 'Species Register' notebooks from his trip to the Malay Archipelago, which meticulously detail the species and specimens of insects, birds and other animals he collected on numerous islands he visited.
WCP4779 and WCP4806: Two of Wallace's address books, which cover the period from c. 1864 to his death in 1913, i.e. most of his adult life. Contacts listed include Charles Darwin, Rajah James Brooke (ruler of Sarawak) and hundreds of other, many of whom were very famous at the time.
The earlier of the address books was used by him between c. 1864 and c. 1872, both for listing addresses and for recording his investments in shares etc. The investment records occupy one end of the book and the addresses start from the other end. Also in this book are some interesting lists, such as a list of the people which Wallace sent copies of his book The Malay Archipelago to when it was first published, and a list of "Persons to whom Hampden has abused me" (John Hampden was a flat earth believer who persecuted Wallace for very many years).
The second address book has been 'opened from both ends' like the first - with address lists running from one end, and notes about garden plants starting at the other end. There are four separate lists of addresses in this book, each of which is arranged from A to Z, and between each and the next address list are various notes and lists, some of which are historically quite important.
WCP4791: Wallace's Last Will and Testament.