M
Magnesium, 175
Mammalia:
reproduction, 326
synopsis, 313
Manganese, 184
in red clay, 1029, 1030
nodules and concretions, 952, 1028
Mechanical analysis of sediments, 958, 970
Mediterranean Sea:
bottom topography, 34
currents, 647, 648
formation of bottom water, 645
oxygen content, 648–650
plant nutrients, 245
water masses, 643–646
Mediterranean Water, spreading of, 670, 685, 686, 745
Medusae:
biological studies on, 320, 820
reproduction, 320
synopsis, 306
Meroplankton (see Zooplankton, temporary)
Messengers, 354
Meter wheel, 338
Micro-plants, significance of, 883–884
Migrations:
eel, 811, 861–862
from land to sea, 283, 302
from sea to land, 284
salmon, 811
vertical, 835–839
whales, 811, 905
Mixing length, 472
near a boundary surface, 479
Mollusca:
reproduction of, 324
synopsis of, 310–311
Momentum, transport of, 472, 473
Mucus feeding, 889, 894
Mud flows, 960