. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 364 DISCOVERY REPORTS corpus luteum, routine measurements of only two diameters have been practicable during slicing. It is assumed that since the corpora appear to be randomly oriented, this does not introduce any important degree of error into the results. The corpora were placed in three morphological classes (independent of size) to be described below. These are termed ' young', ' medium' and ' old' corpora albicantia, and are believed to represent three definite stages in the regression of
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 364 DISCOVERY REPORTS corpus luteum, routine measurements of only two diameters have been practicable during slicing. It is assumed that since the corpora appear to be randomly oriented, this does not introduce any important degree of error into the results. The corpora were placed in three morphological classes (independent of size) to be described below. These are termed ' young', ' medium' and ' old' corpora albicantia, and are believed to represent three definite stages in the regression of the corpus luteum. The evidence for this view is presented below. The mean diameter of 3181 corpora albicantia from pregnant females is 2'56±o-o3 cm., and for 884 from non-pregnant females it is 2-52±o-o7cm. From this season there are only 89 corpora albicantia from females known to be lactating, and the mean size is 2-5±0-9 cm. These differences are not significant, and this mean diameter corresponds to a weight of about 10 g. (see Text-fig. 8). In Text-fig. 11 the percentage size frequency distribution of these corpora albicantia from pregnant S 10. DIAMETER IN CMS Text-fig. 11. Frequency distributions of corpora albicantia sizes. -• pregnant; O O non-pregnant. and non-pregnant females is presented. They range in size from 7 to 80 mm. corresponding to a variation in weight from less than 0-4 g. to about 300 g. It will be noticed that a proportion of non- pregnant females ('resting females') have a large corpus albicans about 4-75 cm. in diameter, whereas the curve for pregnant females lacks this subsidiary peak. The modal diameter for both groups is 2-25 cm. Only 34 corpora albicantia have been weighed, mostly in the size range 4-7 cm., because it is difficult to isolate corpora albicantia for weighing, embedded as they are in the ovarian stroma. The results have been incorporated in Text-fig. 8 where the mean weights for corpora albicantia 2-3 cm., 3-4 cm., 4-5 cm., etc
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