Paper, 'Note on a new constituent of blood serum' by L C [Leonard Charles] Wooldridge Wooldridge writes: 'I wish in the present note to draw attention to a proteid substance which exists in very small quantity in blood serum. Owing to the difficulty of obtaining a sufficient amount, I shall not attempt to give a complete description of its chemical characters, but shall confine myself chiefly to its physiological properties which, I venture to suggest, possess considerable interest.' Annotations in pencil and ink. Subject: Physiology / Haematology Received 19 March 1887. Read 31 March 1887. Communicated by Philip Henry Pye-Smith. A version of this paper was published in volume 42 of the Proceedings of the Royal Society as 'Note on a new constituent of blood serum'. 1887