400 



INDEX 



Weathering influenced by crystalline 

 structure, 229 



by structure of roek 

 masses, 230 

 of alnoite, 209 

 of andesite, 207 

 of argillite, 213 

 of Arkansas syenite, 196 

 of basalt, 205 

 of chert; 215 

 of calcareous rocks, 216 

 of calcite, 236 

 of diabase, 198, 203 

 of diorite, 207 

 of dolerite, 270 

 of dolomite, 236 

 of gneissoid granite, N. Gorden, 



Ya., 192 

 granite in Ceylon, 228 



in Corsica, 236 



in District of Columbia, 185 



in Greenville, Ga., 195 



in Madagascar, 237 

 of greenstone, 229 

 of limestone, 219, 233 

 of phonolite, 197 

 of prehistoric implements, 260 

 of quartzite boulders, 237 

 of rocks, 150 



defined, 151 



early opinions regarding, 

 152 



principles involved, 151 



resumi, 220 

 of sandstone, 213, 233 

 of schists, 234 

 of sedimentary rocks, 212 

 of serpentine, 209 



Weathering of syenite, 196 

 of soapstone, 211 

 of stone implements, 260 

 of ultra-basic rocks, 208 

 physical manifestations of, 227 

 polish due to, 242 

 pre-paleozoic, 262 

 relative amount of material lost 



in solution, 245 

 relative rapidity of, 258 



in warm and cold 

 climates, 263 

 rate of, influenced by position, 

 257 

 influenced by texture, 255 

 results due to position, 238 



incidental to, 253 

 simplification of compounds by, 

 252 

 Websterite, 95 

 Wehrlite, 92 

 Williamsite, 108 

 Wind action, 280 

 Wind-blown sand, abrading power, 



163 

 Wind-drifted soil, 284 

 Wind, effects of, 163 

 erosion, 280 



Zeolites, as conservators of potash, 

 365 

 as rock constituents, 28 

 composition of, 29 

 formation of, 365 

 possible occurrence in soils, 28, 

 363 

 Zircon syenite, 75 



