. Discovery reports. Discovery (Ship); Scientific expeditions. 410 DISCOVERY REPORTS of the unfertilized ovum in whales. In other animals, however, it takes place rapidly, and if the animal is polyoestrous, the corpus has become functionless in time for the ' ripening of follicles for the next oestrous period (Marshall, 1925, p. 48).. LENGTH OF WHALE IN METRES Fig. I. Fin whales, females: Season 1929-30. Frequency of half-metre lengths. Immature whales. Sexually mature whales. 9 Physically mature whales. The length of time the corpus luteum can be recognized in the ovaries is discussed by Mars
. Discovery reports. Discovery (Ship); Scientific expeditions. 410 DISCOVERY REPORTS of the unfertilized ovum in whales. In other animals, however, it takes place rapidly, and if the animal is polyoestrous, the corpus has become functionless in time for the ' ripening of follicles for the next oestrous period (Marshall, 1925, p. 48).. LENGTH OF WHALE IN METRES Fig. I. Fin whales, females: Season 1929-30. Frequency of half-metre lengths. Immature whales. Sexually mature whales. 9 Physically mature whales. The length of time the corpus luteum can be recognized in the ovaries is discussed by Marshall (1922, p. 147). In the human female the corpus is reduced to an insigni- ficant scar two months after ovulation. In the sow, Corner (1925) found that corpora lutea from one ovulation overlapped those of an earlier ovulation during any one sexual season. Donaldson (1924) gives figures which show definitely the accumulation of corpora lutea with age in the rat (Table X, p. 39). Our own work, as stated on pp. 394-6 of the Report (1929), indicates that, by careful examination of the ovaries of whales, traces can be found of all the ovulations that have occurred since the sexual maturity of the animal. It will be seen later that this view is upheld by the facts of physical maturity. One example may be cited. During season 1929-30 two female Fin whales (Nos. 2765,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute of Oceanographic Sciences (Great Britain); National Institute of Oceanography; Great Britain. Colonial Office. "Discovery" Committee. London, New York, Cambridge University Press
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