956 
by volcanic vapours, 235; by lava, 227; 
by plutonic eruptive rocks, 572; rela- 
tion of to eruptive rocks in general, 308, 
541, 544, 546, 550, 556, 561, 587; rela- 
tion of to crumpling of the earth’s crust, 
308 ; relation of to volcanic action, 308 
Metamorphism (continued), contact or local, 
972, 581, 703; regional, 582; examples 
of in Silurian rocks, 583, 672, 673, 685, 
687; of Devonian rocks, 703; of Cre- 
taceous rocks, 833, 919; of eruptive 
rocks, 587 
Meteorites, 9, 64, 76 
Meuse, delta of, 389 
Meximieux, flora of, 871 
Miascite, 138 
Mica, 73 
Mica-psammite, 158 
Mica-schist, 123, 126 
Mica-trap, 139 
Micaceous lustre, 92 
Micaceous sandstone distinguished from 
mica-schist, 124 
Michelinia, 722 
Micraster, 804, 805* 
Microbacia, 804 
Microcherus, 841, 857 
Microcline, 72 
Microcrystalline structure of rocks, 87 
Microdiscus, 649*, 651 
Microlestes, 763 
Microliths (see also Crystallites), 101, 122; 
artificially superinduced in glass, 301; 
in clay slate, 583 
Microlithicstructure of trachytoid rocks, 131 
Micromerite, 90 
Microscope, use of in geology, 187 
Microscopic investigation of rocks, 182 
-— structure of rocks, 94 
slices of rocks, preparation of, 182 
Microtherium, 868 
Miliola, 850 
Millstone Grit, 737, 743 
Mimosa, 862 
Mineral kingdom, transferences between, 
and atmosphere, 452 
Mineral tar, 172 
Mineral veins, 591; variations in breadth, 
591; structure and contents, 592; sim- 
ple and compound, 592; varieties of, 
593; successive infilling of, 593; water- 
worn pebbles in, 595; connection of 
with faults and fissures, 595; intersec- 
tion of, 595; relation of to surrounding 
rock, 596; relation of to thermal waters, 
348; decomposition and recomposition 
of, 597; origin of, 598 
Minerals of chief importance in earth’s 
crust, 60; modes of origin of, 115; 
produced by metamorphism, 577, 579, 
582, 583 
Minette, 139 
Miocene, definition of, 836; description of, 
861 

INDEX. 
Miohippus, 869 
Mio-pliocene, 866 
Mississippi, slope of, 363; ratio between 
discharge of, and rainfall of basin, 361 ; 
annual discharge of sediment by, 371, 
444; rate of recession of Falls of St. 
Anthony on, 378; rate of erosion by, 
444; area of modern alluvium of, 383 ; 
earthquakes in valley of, 271, 273 ; loess 
of, 384; bars and mud lumps of, 386; 
delta of, 389; action of crayfish on em- 
bankments of, 455 
Missouri, ratio of discharge and rainfall, 
361; slope of, 363; rafts of, 368 
Mitra, 840, 862, 881 
Modiola, 723, 774, 806, 847, 878 
Modiolopsis, 652, 665, 679* 
Moffat Black Shale Group, 671 
Moffette, 235 
Molasse (Switzerland), 860, 867 
Moldavia, petroleum of, 173 
Mole, earliest known, 856; geological work 
of, 455 
Molluccas, volcanoes of, 208 
Mollusca, value of as fossils, 611 
Monkeys, earliest forms of, 840 — 
Monoclines, 515, 526, 913 
Monocotyledons, earliest known, 731 
Monodon, 875 
Monograptus, 663* 
Monoliths, defined by joint-structure, 506 
Monotis, 762, 774 . 
Mont Blanc, fan-shaped structure in, 519; 
glaciers of, 405, 406 
Monte Nuovo, 208, 215, 243 
Monticulipora, 668 
Montien (Systeme), 848 
Montlivaltia, '773* 
Monzoni, remarkable local metamorphism 
at, 578 
Monzonite, 578 
Moon, the, 8 ; influence of in tides, 51 
Moorband pan, a ferruginous deposit in 
undrained land, 354 
Moraine-profonde, 411, 888 
Moraine-stuff, 154 
Moraines, 409, 888 
Morosaurus, 801 
Morse, early forms of, 865 
Mosasaurus, 808 
Moselle, craters of the, 210; gorge of, 375 ; ig 
transport of gravel by, 367 
Mosses, destructive action of, 452; pre- 
cipitate calc-sinter, 461 
Moth, oldest known, 732 
Moulins of glaciers, 415 
Mountain-chains, dominant parts of a 
land surface, 37, 924; coincident in 
direction with continents, 35, 37; 
characters of, 37, 918; origin of, 285; 
types of structure among, 913; mode of 
comparing relative ages of, 918; par- 
oxysmal elevation of, 919; uplift of, — 
may have been slow, 920 
