Discovery reports (1937) Discovery reports discoveryreports16inst Year: 1937 228 DISCOVERY REPORTS It would be very difficult to say how the chemical and physical factors of the water exert the influences that bring about these modifications. It is likely that the density of the water, which as shown in the table on p. 159 varies considerably from the tropics to the polar regions, might be responsible to a large degree. 1 V J d 11 1 1 1 1 Jp I -<? /r

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