INDEX. 



577 



PAGE 



Madagascar, methods used by Muntz and Rousseaux 406 



potash and lime leached into valleys 407 



red soils 407, 409 



table of soil analyses 408 



Madras, red soils of 415 



Magnesia, effects of excess over lime 382 



exceeds lime in tropical soils 405 



high in arid soils 381 



leached out next to lime 24 



proper proportions to lime 383 



Magnesian limestones as soil-formers 42 



Magnesian soils largely poor 36 



Magnetite 45 



Maize and sorghums, alkali-resistance 471 



Maize roots in humid and arid region 175, 176 



Manganese, more in humid than arid soils 383 



stimulant effects on crops 383 



Marble and limestones, formation of 39 



Marls, gypseous and calcareous 43 



Marly substrata 186 



Marine saline lands 527 



first crops for 533 



reclamation for culture 534 



Matiere noire ; active nitrification of 132, 360 



Mechanical analysis of soils 88 



Melilots, white and yellow, alkali resistance 473 



Mesas of arid region 14 



Mesopotamia, rehabilitation of 421 



Metamorphic rocks 46 



Methods of irrigation 236 



soil analysis 325 



Mica as a soil ingredient 35 



weathers slowly . 35 



mistaken for gold and silver 35 



Mica-schist soils 51 



Micro-organisms of soils 142 



Mineral fertilizers 63 



ingredients of soils, minor 63 



Minerals injurious to agriculture 73 



major soil-forming, and rock-forming, list of. 29 



tints of 18 



unessential or injurious to soils 75 



Mirabilite 77 



Mississippi, changes in vegetation from east to west in northern 490 



investigations in, by writer 489 



northern, vegetative belts in ; map 490 



vegetative belts, descriptions of 490, 491, 492 



Mississippi river, sediment carried by 7 



