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Photograph of a guide, an arriero, riding on the back of a mule in a farm yard in Uspallata, Argentina in the early 20th century.

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Photograph of a 'choice pair of Draft [Draught] mules out of Percheron mares' harnessed to a wagon with a man standing in the wagon bed in a farm yard in the late 19th or early 20th century.

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Photograph of a Hissar mule.

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Hayward writes that he would like to capture some Burchell's zebras for his estate in South Africa and enquires whether a hybrid zebra and horse stallion would be fertile. He has heard that the Burchell's zebra mixes more freely with donkeys and mules than with horses.

Scope and Contents Keene provides a summary of the reports, which conclude that the campaign in Tibet proved that the zebrules could not compete with ordinary mules. He asks if Ewart has any zebra stallions which the Indian Government could use for stud work and that he was unsuccessful in his application for Secretary of the Royal Scottish Geographical Society. There are two reports on the zebrules' performance in Tibet from Major Fuller, one dated 16 April 1904 and the other 22 January 1905, both...

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Gordon encloses three copies of a photograph of a mule mare and foal taken in the Zoo at Pretoria. He confirms that the mare was a mule and that the foal was not a horse foal.

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Hagenbeck mentions the zebras he has in exchange for 'Romulus' or the Exmoor hybrid and states that he is surprised to find that some people at the London Zoo consider the Przewalski's horse to be a mule. He states that he has sold 'Matopo' to Arthur Yates, refers to the Kiang pony and Korea stallion which he is trying to sell and writes of his anticipated delivery of East African zebras which he will train to harness.

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Sutherland alerts Ewart to the photograph of a peculiar looking mule which he asserts resembles a zebra, and which he wonders might merit some research. He provides some personal details and asks 'what is being done with 'Romulus'?' (Ewart's first zebra/horse hybrid).

Scope and Contents Keene reports on the progress of the zebra hybrids who are being used in a Battry near Simla, India. He writes that the Indian government are complaining at the high price of zebras as opposed to mules, but Keene comments that the price would have been less had they bought the hybrids from Ewart in the first place. He asks if zebra/pony hybrids can produce their own offspring and if Ewart knows of any zebra/donkey hybrids. He asks if Ewart would be able to procure a zebra stallion, as the...

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Brand informs Ewart that he has recently returned from Egypt hoping to call upon Professor Wallace, who would have introduced them. He writes that he has photographs which he took on the Aboukir Company's mule breeding farm near Alexandria of a mare with twin horse and mule foals. He comments that this must be a very rare instance of 'double conception' and says he would be happy to show Ewart the photographs.