In 1880 Budge published an account of a canal system which he had discovered in the mesoderm of early chick embryos; and in 1887, after Budge’s death, His published a further but necessarily incomplete account of this work from Budge’s notes and pictures. Budge injected the false amnion of chicks three days old, and found that the fluid ran out into the area vasculosa as if in ducts. He then injected along the arteries in chicks from nine to eighteen days old and obtained beautiful injections of undoubted lymphatics. These two experiments are related to one another in the text by the following theory: Budge thought that there were two lymphatic systems, and that the first or primitive system was present in the three-day chick. He thought that the false amnion and ccelom being continuous, there were ducts within the body wall connected with the cdom, analogous to those of the area vasculosa which he had injected from the false amnion. The ducts within the body lying along the dorsal line became pinched off from the ccelom and united to form a thoracic duct. With the thoracic duct began the second or permanent lymphatic system, which he had injected along the arteries in nine-day chicks. This idea of relating the lymphatic system to the serous cavities has remained but a theory and the gap between the two systems of Budge has never been filled.