Scope and Contents Osborn writes concerning his forthcoming trip to England and asks if he might meet with Ewart at Woburn Abbey when he will be visiting the Duke of Bedford. He mentions that he will see Ewart's zebra hybrids in St Louis in the autumn and that he will send Ewart a photograph of Neohipparion, 'the most deerlike horse yet discovered'. He states that he will be requiring some images from Ewart to illustrate his lecture series on the evolution of the horse at Columbia...

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Osborn states that the pony has arrived safely in New York. He will have the animal photographed for Ewart soon. He mentions not having read the papers by Mendel and Bateson. He announces that he will be writing to the Duke of Bedford to say that he would be interested in receiving the skeleton of one of his Russian horses if one should die. He also states that James Gidley is revising the species of their miocene, and he criticises Othniel Charles Marsh's phylogeny.

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Osborn thanks Ewart for his visit to Penicuik and asks him for some glass slides and photographs. He recommends that when Ewart visits the British Museum again he studies the hoofs of Onohippidium as they resemble a zebra more than an ass or horse. He asks Ewart to procure him a hoof of an ass or Przewalski's horse if he is able.

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Osborn confirms that he is continuing to gather information regarding his and Ewart's trip to Mexico in February 1905. He also writes that he would like slides made of Ewart's original drawings representing the ontogeny of the horse.

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Osborn writes that he will be arriving in Mexico later than planned but that he will contact Ewart on arrival. He hopes they will have time for a trip to Metta and to the west before they head north to Chihuahua. He recommends that Ewart learn some horse terminology in Spanish and confirms details of their planned journey.

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Osborn writes that he is sending Ewart the slides he selected in return for those Ewart sent him. He is writing an article on the peculiarities of the Arab skeleton which he will publish in Science. He is also publishing a brief description of their observations on horses in Mexico.

Scope and Contents Osborn reports the safe arrival of the Equus caballus and Equus caballus celticus. He feels strongly that the Museum should have Ewart's original type specimen of Equus caballus celticus because it agrees more closely with his original characterisation of the species in the small size of the head. He asks whether it would be practical to have the skin removed and the skeleton sent to them, as the specimen Ewart...

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Osborn writes that he will shortly send Ewart a revision of the Equidae, which he calls 'a dry, exhausting piece of work, which is, however, absolutely essential for the more interesting monograph which I trust will follow one day.' He reports that the Celtic pony is now in full coat and is not typical. As it lacks many of the specific characters on which Ewart established the subspecies, he requests again the skeleton and skin of the type.

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Osborn writes that he is still working on developing the horse collection at the Museum and preparing his memoir on the Evolution of the Horse. He hears from Director Hornaday that the Scandinavian and Celtic ponies will have to be disposed of as they are eating too much. He once again requests the skeleton and skin of the original Celtic pony to be sent to him.

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Osborn, writing from the American Museum of Natural History, expresses interest in Ewart's work on telegony and the embryology of the horse. He mentions that he is also sending Ewart papers about the ancestral history of the horse.