[Cyclic changes in lymph vessels in the pig uterus. Studies of the endometrium]

By means of the orthograde application of Patent Blue Violet and Japanese ink, it was possible to demonstrate the cyclical changes in the uterine lymphatics of the pig. It was found that the lymphatic vessels in the endometrium were markedly dilated during oestrus. In the following phases of the cycle the lymphatics showed a reticulate pattern, which in the stage of preoestrus resembles that seen in oestrus. The transport of the dye into the lymphatics takes place extremely rapidly through the wall of the uterus and then into the mesometrium (serosa), where the lymphatics have a typically beaded appearance.