IT was a happy thought that prompted some of his colleagues to obtain Sir John McFadyean's consent to allow them to design and edit the December (1937) number of the Journal of Comparative Pathology and Therapeutics as a jubilee number and Festschrift. This number forms the conclusion of the fiftieth volume of the journal, which was founded by Sir John McFadyean in 1888, and has since been edited by him almost entirely single-handed, and this unique occasion has been utilized to issue this number as a Festschrift in honour of Sir John's outstanding contributions to veterinary science during his long career. These have been mainly confined to problems concerning the control of tuberculosis, contagious abortion and glanders among farm animals, the etiology and occurrence of Johne's disease in Great Britain, and the discovery that the virus of horse sickness is a filterable one. The esteem in which Sir John is held is manifest from the contributions contained in this number, which come from all parts of the world. Appreciations of the man and his work are contributed by many, including Sir John Kelland of the Ministry of Agriculture and Fisheries ; Sir Robert Muir ; Sir John Ledingham ; Prof, von Ostertag, Tübingen ; Dr. Schmaltz, Berlin ; Prof. Leclainche, Paris ; Dr. Mohler, United States ; and Dr. Hilton, Canada. o Several excellent portraits of Sir John are reproduced.