Paper, 'On the leucocytes of peptone and other varieties of liquid extravascular blood' by Almroth Edward Wright Wright writes: 'In the course of some investigations on the subject of blood-coagulation, I was led to enumerate the white blood corpuscles in the different varieties of extravascular blood. I propose to report the results of these enumerations here, and to direct attention to the bearing of the results obtained in the case of peptone blood.' Annotations in pencil and ink. Subject: Haematology Received 1 February 1893. Read 9 February 1893. Communicated by Augustus Desire Waller. A version of this paper was published in volume 52 of the Proceedings of the Royal Society as 'On the leucocytes of peptone and other varieties of liquid extravascular blood'. 1893