296 STATE BOARD OP AGRICULTURE. 



Unkached Leached 



Name of Rocks and Minerals 75 per cent 75 per cent 



moisture moisture 



Mica-schist 036 .009 



Pegmatite 025 .010 



Peridotite 042 .021 



Quartzite 020 .009 



Quartzite 022 .008 



Quartzite (baraboo) 012 .003 



Scotch granite 032 .010 



Shale 050 .010 



Shale ,.050 .010 



Sihceous dolomite 050 .010 



Siliceous sandstone 030 .009 



Syenite 035 .008 



Syenite 024 .008 



Apatite ' .022 .010 



Amphibole 015 .008 



Apophyllite 069 .027 



Calcite 012 .007 



Chryrolite 016 .006 



Epidote 016 .009 



Gypsum 044 .042 



Hematite 010 .005 



Kaolinite Oil .010 



Limonite 010 .006 



Oligoclase 020 .009 - 



Orthoclase 010 .008 



Prochlorite 017 .008 



Pyroxene 030 .008 



Quartz 008 .006 



Serpentine 050 .020 



Siderite 035 .015 



Stilbite 008 .005 



Talc 015 .010 



Zircon 010 .007 



It will be immediately seen from the above table, therefore, that the freez- 

 ing point depression, and consequently the amount of material in solution, 

 is appreciably or much smaller after leaching than before leaching, in all the 

 rocks and minerals, with few exceptions. 



These results go to show, therefore, that when rocks and minerals are 

 ground very fine they allow a considerable amount of their material to go 

 readily into solution, but when this easily soluble material is leached with 

 few exceptions, its place is not immediately taken by other soluble material. 



The reason for these phenomena together with the nature of the material 

 that goes into solution and the mechanism of solubiUty involved, will be 

 discussed more appropriately and intelligently, subsequently in connection 

 with other phases of the general investigation. Meanwhile it is desired 

 to direct attention to a significant point that is suggested by the foregoing 

 experimental results in regard to the amount of soluble material in the soils, 

 and drift material at the glacial period. One of the works that the great 



