. 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. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. 7IO DEPTHS OF THE OCEAN interest attaches to the fact that the immigra- into Norwe rapidly and the lower temperatures gradually descend towards deep water during early spring and summer. Great changes in specific gravity, viscosity, and light-intensity accompany these changes in temperature ; in the very ma
. 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. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. 7IO DEPTHS OF THE OCEAN interest attaches to the fact that the immigra- into Norwe rapidly and the lower temperatures gradually descend towards deep water during early spring and summer. Great changes in specific gravity, viscosity, and light-intensity accompany these changes in temperature ; in the very magnitude of these changes we must look for the essential difference between the tropical and subtropical conditions on the one hand, and the arctic-boreal conditions on the other. The greatest tion of Atlantic forms season when the condi- tions in the latter are most similar to those of the Atlantic. The in- ternational investiga- tions have contributed to our knowledge on this immigration. Schmidt,^ for instance, in the Danish investiga- tion-steamer " Thor," had the opportunity of studying the immigra- tion of Salpae from the Atlantic into the Nor- wegian Sea, and writes as follows :— " The organisms concerned were the dis- tinctly Atlantic Salpse (especially Salpa fusi- fornns), which are so characteristic and which were taken often in hundredweights in each haul of our pelagic apparatus in the Atlantic beyond the looo-metres line. The year 1905, during which we several times crossed the North Sea, made two cruises to and from Iceland and the Faroes, following approximately the looo-metres line, then sailed southwards west of the British Isles to the Bay of Biscay, was thus specially well suited to give light on these conditions, as I have endeavoured to delineate on the accom- panying Chart [reproduced in Fig. 510]. The shaded lines 1 Jobs. Schmidt, "The Distribution of the Pelagic Fry and the Spawning Regions of the Gadoids," etc., Rapports et pro
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