650 
MaGGIorE, Lake of, importance of, as basin of 
reception, 495 
MAGNITUDE, unit of, nature has none, 145 
MAtmzeE, acclimation of, 18, note 
Mara, transported soil of, 629 
Man, reaction of, on nature, 8 
action of, on organic life, 10, note 
measurement of influence of, uncer- 
tain, 14 
destructiveness of, 33, 35. note; 36-41 
first conquests over nature, 38, note 
geographical action of, compared with that 
of brutes, 41 
physical improvement by, 44 
limits of his physical power, 45 
Temains of, contemporary with mammoth, 
82, note 
agency of, in extirpation of fish, 101 
of aquatic animals, 105 
of birds, 116-129 
possible control of minute organisms by, 
140 et seqq. 
possible geographical changes by, 609 et seqq. 
incidental effects of his action, 639 et seqq. 
action of, illimitable and never-ending ef- 
fects of, 648, 644 
MankcIteE of Lombardy, 461, note 
Maremma, Tuscan, improvements in, 
seq. 
MarsuHes, how far unhealthy, 158, note 
draining of, in Italy, 436 
United States, 437 
climatic action of, 440 
insalubrity of mixture of salt and fresh water 
in, 527, note 
MatcuHeEs, Lucifer, 856, note 
MECHANIC ARTS, illustration of their mutual 
interdependence, 870, note 
despised by ancient Romans and in Middle 
Ages, 427, 20te 
not respected in Modern Italy, 427, note 
MEDANOS or dunes of the South American Des- 
ert, 601, 602 
MEDITERRANEAN SEA, not rich in organic life, 
98 
sands of, 549 
tides of, 564 
MELLA river, change in character of, 264, note 
MeEnGorrTi on Nile, 516 
METEOROLOGY, uncertainty of this science, 22 
nomenclature of, vague and equivocal, 23, 
note 
METRICAL SYSTEM, French, objections to, 146, 
note 
Mexico, Desaguadero at, 402, note 
528 et 
INDEX. 
MICHIGAN, Lake, sand dunes of, 564 
sand dunes of, originally wooded, 579 et segq. 
diversion of its waters, 626 
MINES, adits of, 403, note 
excavations for, 630 
depth of greatest, 631, note 
™ fires in, 633 
Minin, effects of, 630 
hydraulic, 632 
practised by ancients, 632 
MIRaMIcHI, great fire of, 27, note 
MissIssiepi, alleged increase in volume of, 229, 
note 
discharge of, 472, 519, note 
delta of, 501, note 
levées of, 511 
cut-offs and their effects, 514 
sediment of, 521, note ; 548, note 
precipitation in the valley of, 519, note 
MISTRAL, noticed by Diodorus Siculus, 165, note, 
MONASTERIES, evil effects of, 5, ote 
MOOSE DEER, the American, rapid multiplica- 
tion of, 388, note 
MorGAn, L. H., on the American beaver, 84, note 
Monre Testaccio, 641 
Mr. CENIs, excavations for, 403, note 
gunpowder used in, 403, note 
Mosses and fungi, uses of, 233, note 
MOUNTAINS as reservoirs of water, 215 
MOUNTAIN SLIDES, their cause, 284 
woods, as protection against, 290 
MUSHROOMS, poisonous, how to render harmless, 
294, note 
NATURAL BRIDGE in Virginia, disappearance of 
river at, 473, note 
NATURAL FORCES, accumulation of, 43 
resistance to, 685 
NATURE, its action on man, 7 
man’s reaction on, 8 
observation of, 11 
geographical stability of, 26-31 
restoration of disturbed harmonies of, 48 
nothiug insignificant in, 643 
NETHERLANDS, ancient inundations of, 404 
recovery of land by diking in, 404, 405 
extent of land gained from sea, 407 
lost by incursion of sea, 408 
character of land gained by, 409 
natural process of recovery, 410-412 
method of construction of dikes, 413 
modes of protection of coasts in, 414, note 
effect of diking on the level of the land, 
415 , 
drainage, 415, note, et seqg. 
