. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. CORPORA ALBICANTIA, CORPORA ABERRANTIA AND CORPORA ATRETICA 369 finally lose their lumen and become solid cords of connective tissue. There is some evidence that the external diameter of the arterioles may also increase with age. The average diameter of 10 arterioles in the single corpus luteum examined is 95-3 //, for 147 arterioles from 'young' and ' medium' albicantia it is 109 ft, and for 111 arterioles from ' old' corpora it is 130 fi. This difference is not, however, statistically signific
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. CORPORA ALBICANTIA, CORPORA ABERRANTIA AND CORPORA ATRETICA 369 finally lose their lumen and become solid cords of connective tissue. There is some evidence that the external diameter of the arterioles may also increase with age. The average diameter of 10 arterioles in the single corpus luteum examined is 95-3 //, for 147 arterioles from 'young' and ' medium' albicantia it is 109 ft, and for 111 arterioles from ' old' corpora it is 130 fi. This difference is not, however, statistically significant. The relative thickness of the vessel wall seems to be a better quantitative index of the age of the corpus than the diameter of the corpus and in general there appears to be less overlap between the two groups of corpora albicantia in respect of this character. It would be interesting, though laborious, to determine the relative thickness of the arteriole walls for a complete series of say thirty corpora albicantia from one pair of ovaries so as to gain some idea of the variation in corpus size within a single animal. Since for corpora albicantia of similar age, those formed from corpora lutea of ovulation will be smaller than corpora albicantia of pregnancy, it might perhaps be possible to identify corpora of these two origins and to place them in a chronological series. It might also be possible in this way to establish the relative frequency of corpora lutea of pregnancy and ovulation. This is the only possible means of distinguishing corpora albicantia of pregnancy from corpora of ovulation which is suggested by the present study. It depends on the assumption that although there is a large variation in corpus luteum size in the whole population, for a single female it might be expected that the size variation in corpora lutea of these two origins would be slight. 5 u a UJ \- uj < a a. a O U. IO 20 30 40 50 60 70 SO 90 ARTERIOLE WALL AS°/0OF TOTAL DIAMETER ICO Text-
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