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Photograph of a team of draught horses pulling a plough driven by one man while another works to remove rock and soil from one of the American Museum [of Natural History?] quarries in central Wyoming in the early/mid 20th century.

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Photographs of horse skeletons showing the increase in size of the horse over time. The image shows a small articulated skeleton of the Eohippus, placed beneath the limbs of the original American horse or Equus scotti as mounted in the American Museum of Natural History in New York, USA with a scale next to them showing the progressive increase in size.

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 thanks Ewart for the 'Multiple Origin of Horses and Ponies', stating that it will be useful to him on his forthcoming trip to Europe, where he hopes to meet Ewart.

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Osborn writes that the Museum hopes to purchase the 'Celtic' pony later that year. They wish to have him in his winter coat so that the skin could be mounted separately from the skeleton, and he asks advice on what time of the year to purchase him. He compliments Ewart on the progress he is making with the breeding of domesticated animals.

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Osborn writes that he is delighted that the Celtic pony is to be added to the type collection in the American Museum of Natural History. He believes it will be advantageous to have the pony exposed to the winter climate to bring out its distinctive coat characteristics. He is glad to hear from Ewart about the progress being made with the zoological park. At present he is busy completing the Titanothere volume, but he will appreciate Ewart's researches when he comes to the horse volume.

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 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.

Scope and Contents Osborn writes that he has not heard from Ewart for years, despite his own letters to him. He reminds him about his promise of securing the original Celtic horse as the type specimen of Equus caballus celticus for the Museum. He reports that the little stallion Ewart sent to the Museum shows around 95% Celtic characters, and enquires whether Ewart knows of a pure little Celtic mare they could import for breeding purposes. He has been corresponding with Breuil about...

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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.