Archive image from page 103 of The depths of the ocean;. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic depthsofoceange00murr Year: 1912 72 DEPTHS OF THE OCEAN CHAP. Relation between Mediter- ranean and Atlantic waters. procured at Gibraltar were a thorough success, and stopped the twisting in the trawl-warp and bridle. The bottom was every- where well adapted for trawling. At Station 23 we towed a small young-fish trawl at 1215 metres. It touched the bottom
Archive image from page 103 of The depths of the ocean;. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic depthsofoceange00murr Year: 1912 72 DEPTHS OF THE OCEAN CHAP. Relation between Mediter- ranean and Atlantic waters. procured at Gibraltar were a thorough success, and stopped the twisting in the trawl-warp and bridle. The bottom was every- where well adapted for trawling. At Station 23 we towed a small young-fish trawl at 1215 metres. It touched the bottom and brought up a quantity of empty pteropod shells which had been sifted out from the bottom deposit. It is extraordinary to find these deposits of shells belonging to plankton organisms only at certain relatively shallow and intermediate depths, for, when alive, the pteropods float over all depths. Our trawlings further resulted in a fine collection of invertebrate animals ; at Station 24, for instance, we found the trawl full of siliceous sponges. These waters offer a good field for a thorough study of the distribution of animal life, for the nature of the bottom and the gentle slope permit of trawling at all depths. Our time unfortunately was too short to permit us to do more than obtain a general impression. We next turned our attention to the hydro- graphical investigations, and steamed to the north side of the bay near Cadiz (Station 26), whence we ran a series of stations, at all of which careful hydrographical observations were made (Stations 26-30). At the conclusion of the ' Challenger' Expedition Buchan showed that it was pos- sible to trace the course of the comparatively warm Mediterranean water out into the North In 1909 the Danish expedition in the ' Thor ' made some observations from the Strait of Fig. 50.—The Swivel. New Atlantic Ocean, under Schmidt Gibraltar westwards, and secured extremely accurate determina- tions of temperature and salinity, showing
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