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T h e study is a prelinlinary report o f observations which will be presented i n full i n the Memoirs o f the Rockefeller Institute for Medical Research and which were renderea possible by grants from the Rockefeller. Institute and the Robert Koch Stiftung, Berlin.

The Blood Supply of the Human Parathyroid Glandules. Herbert M. Evans. The vascular injections and studies herein reported were made to determine accurately the exact source and position of the blood supply to the para¬ thyroid glands in man. Another aim, that of knowing more of the angiology of the parathyroid gland itself, was also served, but this subject will be reported separately at a later date. I would here express my indebtedness to Professor Halsted at whose suggestion the problem was undertaken, to Pro¬ fessor Mall in whose laboratory the injections were made, to Professor W. G. MacCailum, Dr. II. E. Ilelmholz and espe¬ cially Dr. Marshall Fabyan who have kindly given me many opportunities to secure fresh human material, and to Mr.