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The object of this Communication was to demonstrate two rheological properties of cervical secretion, namely, flow-elasticity and Spinnbarkeit. There is evidence that these properties undergo cyclic variation during the menstrual cycle and bear relation to ovulation, to penetrability by spermatozoa and to pregnancy. By means of the menstroscope, designed by Scott Blair, flow-elasticity or elastic recoil can be measured. It is found to be most marked at the time of ovulation when also the mucus is thin and transparent. Spinnbarkeit—the capacity of liquids to be drawn into threads—is also capable of accurate measurement by drawing away a coverslip placed on a blob of mucus which is drawn out into a long thread. It is also more marked at the time of ovulation and is almost absent in pregnancy. Plasticity and tack, two further properties of cervical mucus, were also discussed. It is believed that these tests will prove to be of value in diagnosis of ovulation and in the study of sterility.