INDEX 



431 



Limestone, effect of carbonated 



water on, 22 

 factor in maintaining organic 



content of soil, 145 

 Valleys and Uplands province, 



83 



Lister, work of, 331 

 Lithological factor in classification 



of soils, 73 

 lx>ams, 115 

 clay, 115 

 graVelly, 1 16 

 peaty, 114 

 sandy, 116 

 fine, 116 

 silt, 115 

 stony, 116 

 Locust, black, holds sand, 59 



growing on gullied land pre- 

 vents erosion, 308 

 Loess and dust, physical analyses, 



64 



chemical analyses of, 65 

 defined, 61 

 deposit, connected with lowan 



glaciation, 62 

 deposits, 48 

 formation of, 62 

 "kindchen," lime concretions, 62' 

 occurrence of, 61 

 origin of, 61 

 texture uniform, 64 

 ertieal walls or cleavage, char- 

 acteristic of deep, 63 

 Loosening soil, an object of tillage, 



325 

 Loss by evaporation, effect of, on 



transpiration, 191 

 of manure and its prevention, 



163 

 on ignition, 154 



compared with organic mat- 

 ter. 154 



Losses of organic matter, 151 

 Ixnighridge, rise of water in clay. 



206 



Lyon, T. L.. and Fippin, E. O.. sur- 

 face tension and density of certain 

 solutions, 206 

 Lynde and Diipre, capillary pull. 211 



osmosis in soils, 212 

 Lysimeters or drain gages, 220 



Macro-organisms, insects, 315 

 plants. 316 

 rodents, 315 

 worms, 315 



Magnesia in prairie compared with 



timber soils, 75 

 and lime in soils, 75 

 Magnesium carbonate, dolomite, 5 

 Magnetite, 6 

 Maintaining and increasing organic 



matter in soils, chapter on, 158 

 Major crops, defined, 376 

 Mangrove marsh, Florida, 37 

 Mangum terrace, 366, 367 

 Manure, barnyard, 161 



conserved by use of absorbents, 



165 

 farmyard, influence of, on soil 



temperature, 294 

 nitrogen content of, 399 

 fresh, composition of, 163 

 green, 160 



loss of, and its prevention, 163 

 by fermentation, 164 

 by leaching, 164 

 organic matter, in rotting of, 



163 

 methods of applying, 168 



of handling, 165 

 solid and liquid, value of, ex- 

 creted by farm animals, 162 

 spreader in action, 167 

 steer, composition of, after ex- 

 posure, 166 

 value of increase due to, per 



ton, 168 



Marbut, C. F., and others, area re- 

 sidual soils in United States, 

 mapped, 27 



Bureau of Soils, soil survey, 78 

 Marine soils, 36 

 Marl, 8 



Marram, or beach grass, transplant- 

 ing, 56 

 Marsh, marine, section of, 36 



mangrove, Florida, 37 

 Marshes, early stages of formation, 



map, 36 

 defined. 27 

 Martin. F. O.. and others, chromic 



acid method, 154 



Material in solution in streams, 24 

 Maumee. Lake, 38 

 Maximum water capacity of soils. 209 

 MeLane, with Hriggs, moisture 



equivalent centrifuge. 202 

 Meadows, hold soil against erosion, 



361 



Measurement of irrigation water, 

 268 



