Astbury writes that at the Textile Physics Laboratory at the University of Leeds thay have just begun an X-ray study of the structure of feathers, in the aim of revealing more about the constitutions of the keratins in general. He reports that the quill end of goose or hen feathers produces an X-ray photograph which is quite different from ones he has obtained from wool, hair, fingernails, spines and horn. However, he would like to know more about the structural and biological nature of all the epidermal growths, epecially feathers and fish scales, and he asks Ewart to send him copies of his own publications on these subjects. He also requests some large quills (such as those of the penguin).