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Naturalist
- Exchanging insect lists with Bates and keeping a journal
- Wallace's advice to Bates on writing a book
- Wallace on animal distribution and admiration of Darwin
- Wallace on wild flowers in Java and England
- Wallace on biogeography
- Portrait of Wallace
- Comments on the distribution of birds in Celebes
- Flowers at The Dell
- Proof illustration of the animals of New Guinea
- Proof illustration of the birds of the Malay forest
- Proof illustration of the animals of Borneo
- Proof illustration of the birds of the Upper Amazon
- Proof illustration of the animals of a Canadian forest
- Proof illustration of the animals of Madagascar
- Darwin's notes on Wallace's Island Life book
- Wallace explains flower anatomy
- Wallace's Lowell Institute lecture on continental islands
- Report on Darwinism lectures
- Response to Wallace's lecture on colours of animals
- List of Wallace's lectures in the USA
- Information on astronomy and the death of Bates
- Notes on glacial lakes
- List of payments for lectures
- Attending the Cambridge University Natural Science Club
- Naming a spider Friula wallacii
- Wallace in his garden
- Photographic proof print of a redwood tree
- Annotated proof print of an orang-utan
- Annotated proof print of a gibbon
- Annotated proof print of a lemur
- Wallace donates his Amazonian fish drawings to the British Museum
- Science in 1907 manuscript
- Science in 1907 newspaper article
- Reply from Tring Zoological Museum about bird species
- Wallace and the Croydon Natural History Society
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Comments on the distribution of birds in Celebes
Catalogue number: MSSWALL4
Letter from Wallace to Lord Walden commenting on the latter's catalogue of the birds of Celebes (Sulawesi), dated August 1872.
Wallace wrote this letter to the ornithologist and president of the Zoological Society of London, Lord Walden (previously known as Arthur Hay, 9th Marquess of Tweeddale). Walden had produced a catalogue of the birds of Celebes (now Sulawesi) showing their geographical distribution. Since this was an area of Wallace's expertise, he made comments on the catalogue. Wallace suggests an alternative and clearer way of allocating birds to a region.
Wallace originally noticed a separation of species in the region and lent his name to the boundary that separates the zoogeographical regions of Asia and Australasia: the Wallace Line. This imaginary line runs through the Malay Archipelago, between Borneo and Celebes (now Sulawesi), and between Bali in the west and Lombok in the east. West of the line are Asian-related species; to the east are Australian-related species.
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Wallace Letters Online
View high resolution scans and transcripts of Alfred Russel Wallace's correspondence, including all surviving letters between him and Charles Darwin.