MacBride thanks Ewart for his telegram with the details he needed about Darbishire for his obituary, which he has sent to Nature. He is delighted with Ewart's work on the embryology of the horse, and believes that 'it is only by slow painstaking work of this kind that a real science of Comparative Embryology will ever be built up.' He is glad that Ewart gives no countenance to the 'crook theories' about the layers of the embryo.

The letter is undated.