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The first detailed .microscopic study of the uterine vasculature by Freund ('04) showed that completc injections are difficult to obtain. He found it necessary to wait for from one to 4 days after death o r removal surgically in order to obtain satisfactory preparations. Injection mass appears to have reached the endometrium in only 6 of his 23 adult specimens. Recently, Hasner ( '46), Dalgaard ( '46), and Schlegel ( '46) had to resort to similar delays ; the last mentioned had, in addition, to use pressures up to 700 mm H g in order to force injection masses into the vessels of the endometrium. However, Sampson ('11 8s.) had obtained injections of both myoand endo-metrium promptly after removal at hysterectomy.