Dr. Keiller exhibited a specimen of an entire ovum, which had been expelled prematurely about the fifth month. He had been called to see the patient (who was a servant) some time since; and as she was suspected of being in the family-way, he examined her breasts, and came to the conclusion that she was pregnant. She was taken prematurely in labour, had been sent to the Maternity Hospital, and s...

The comb jelly Mertensia ovum, widely distributed in Arctic regions, has recently been discovered in the northern Baltic Sea. We show that M. ovum also exists in the central Baltic but that the population consists solely of small-sized larvae (less than 1.6 mm). Despite the absence of adults, eggs were abundant. Experiments revealed that the larvae were reproductively active. Egg production and...

There are two populations of sperm in bull semen. One consists of X-chromosome-bearing sperm; the other consists of Y-chromosome-bearing sperm. In contrast, all cattle ova contain an X chromosome. That is why when an X-chromosome-bearing sperm fertilizes the ovum a female (XX) develops, and when a Y-chromosome-bearing sperm fertilizes the ovum, a male (XY) develops. Ratios of the number of male...

to develop until the tenth or twelfth week, the case usually terminates in rupture of the tube, with its well-known symptoms. But at an earlier period than this, during the first five or six weeks, other changes may take place, involving both the developing ovum and the tube in which it is contained. Of these changes, one of the most important and interesting is that of tubal abortion. We may, ...

BACKGROUND We aimed to investigate whether multifetal pregnancies are at risk of more pregnancy complications in women of advanced age after ovum donation. METHODS Pregnancy outcome in women after ovum donation aged 40 and above was extracted. Labor and delivery data as well as antenatal records of women carrying twins were compared with those of singletons, as well as to a control group of a...

I'HIS paper is based on a review of all cases of multiple pregnancy occurring in the Belfast Maternity Hospital, Townsend Street, and the Royal Maternity Hospital, Belfast, during the last ten years 1927-36. During this period, 164 mothers were delivered of twins, and one mother was delivered of triplets, i.e., 165 mothers gave birth to 331 babies. The number of twin pregnancies over this perio...

Accessory sperm number and its relationship to fertilization and embryo quality was evaluated in cattle after nonsurgical recovery of ova or embryos 6 d after insemination. Efforts to alter accessory sperm number per ovum included 1) blockage of retrograde sperm loss at insemination using a modified insemination device, 2) elevated sperm number per inseminate (40 x 10(6) vs 20 x 10(6], and 3) a...