. Discovery reports. Discovery (Ship); Scientific expeditions. THE SEASONAL VARIATION WITH THICK FILM 275 south during December, and since all the figures are high they support the view that the whales were concentrated to an unusual degree at the beginning of that season. The fact that Fin whales are more frequently infected than Blue whales on the South Georgian grounds, is amply borne out by these figures. While the number of whales examined was not large enough to be conclusive, however, the collection made by Mr Laurie in the ' Southern Princess' indicates that Blue whales are just as fre
. Discovery reports. Discovery (Ship); Scientific expeditions. THE SEASONAL VARIATION WITH THICK FILM 275 south during December, and since all the figures are high they support the view that the whales were concentrated to an unusual degree at the beginning of that season. The fact that Fin whales are more frequently infected than Blue whales on the South Georgian grounds, is amply borne out by these figures. While the number of whales examined was not large enough to be conclusive, however, the collection made by Mr Laurie in the ' Southern Princess' indicates that Blue whales are just as frequently infected farther south. Evidently the maximum of diatom infection is to be found at OCT 40H 30 20 H 10 NOV FEB MAR&APR. 1929-30 ~/0 4-0 30- 20- 10- 1930- NOV DEC JAN FEB* MAR Fig. 6. The seasonal variation in the percentage of whales with thick film during the three seasons studied at South Georgia. Solid lines Fin whales, pecked lines Blue whales. the maximum southern concentration of the given species of whale, and here we have but another expression of the fact that the centre of the southern concentration of Blue whales lies well to the southward of that of the Fin. The opinion that most of the Blue whales taken on the South Georgian grounds during the seasons studied, were on passage to and from other feeding grounds also gathers strength from these figures. It will be seen from the small number of observations obtained at the South Shetlands at mid-season (p. 271) that the percentage of Fin whales with thick film was exceptionally high, while the percentage infection was quite normal. It follows that at the time the. 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. "D
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