. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. GRAAFIAN FOLLICLES 349 pregnancy humpback whales have, therefore, been inserted in Text-fig. 4 at a foetal length cor- responding to late pregnancy in the fin whale. Another factor which must be mentioned is that in mature blue and fin whales the diameter of the largest follicle is proportional to the body length (Nishiwaki and Oye, 1951; Nishiwaki and Hayashi, 1950). It is shown later (p. 411) that older mature females are in advance of younger mature females in their sexual cycle and, therefor
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. GRAAFIAN FOLLICLES 349 pregnancy humpback whales have, therefore, been inserted in Text-fig. 4 at a foetal length cor- responding to late pregnancy in the fin whale. Another factor which must be mentioned is that in mature blue and fin whales the diameter of the largest follicle is proportional to the body length (Nishiwaki and Oye, 1951; Nishiwaki and Hayashi, 1950). It is shown later (p. 411) that older mature females are in advance of younger mature females in their sexual cycle and, therefore, have the larger foetuses at any one time. In the material under consideration, which is limited in time to a few months, the average maternal age and the average maternal body length increase with increasing foetal length. In accordance with the findings of the Japanese workers there would, therefore, be a bias towards larger follicle diameters in the second half 100 § so. 9 8 U uj i- uj 5 5 -1 3 U. 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 of Great Britain; Great Britain. Colonial Office. Discovery Committee. London ; New York : Cambridge University Press
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