Thus, _Hohl_ writes: “Numerous observations have shown that in females endowed with a considerable degree of nervous susceptibility, and especially in nulliparae, during examination and during any increasing irritation, not only is there an increased secretion of the vaginal mucus, but also a momentary descent of the uterus and an opening of the os uteri externum, so that this orifice has the appearance for the instant of the open mouth of a tube.” _Litzmann_ reports that during the vaginal examination of a young, extremely erethistic woman, the uterus suddenly assumed a more vertical position, and came lower down in the pelvis; at the same time, the lips of the cervix became equal in length, the os uteri externum became rounded, soft, and penetrable by the finger; whilst the breathing and the voice indicated the occurrence of intense sexual excitement. _Rouget_ assumes that the body and the fundus of the uterus constitute an erectile organ, which however possesses capability for erection only during the period of ovulation; _Hewitt_, on the other hand, considers it extremely probable that the erection may occur at any time during sexual intercourse, whether ovulation is proceeding or not. _A. Wernich_ considers, basing his views in part on personal observations, that erection of the lower segment of the uterus occurs, like erection of the penis, whenever a moderate degree of sexual excitement is experienced; in women, however, he believes that erection is seldom extreme, and that it declines with the other symptoms of sexual excitement, viz., flushing of the face, moisture and glistening of the eyes, peculiar groaning expiration, etc. Whereas during ovulation, erection is merely a necessary concomitant of the other menstrual processes; during coitus, erection not only occurs much more powerfully, but it is also an important—perhaps the most important—contributory factor in effecting fertilization.