XTV 
Rocks, conversion into soils........ 122 
Roots, direct action on soil........ 326 
Saline incrustations................ 179 
PILED OEGES J Aas coi a? os See Se Ome 252 
Salts decomposed or absorbed by 
CHB BOM. ocd. kote eee ee 
ORME ee Riess thay ee be See ee ee 153, 162 
SEES U1) eg Pi oes Ona 172 
Sandstane. jo aici. cs ceasceee ee 121 
BerpenuNest-Fi. se see se 114, 121 
SehHish, MICACCOUS. |. <0: j.ss0 « eee 119 
a THLCORE A. Oy. cctraoec ee eras 121 
ee chlorite: ...:\. -aeaseecer sae 121 
phaless.s. se eee 122 
Sherry wine region.:.:......... 22: 192 
Shrinking: of soilss..; : 5562 ewes 183 
Silicate. Si esses ee eee 108 
“function mthe soil, <2 e7ae 353 
*“ of soil, liberated by strong 
ACIASLS. 4a. eRe eee 330 
DUICAtES [0:7 . Ooo nee ee ee 109 
Ss zeolitic, presence in soils. .349 
Silicic acid, fixed in the soil........358 
SKS MYCTOSCOPIGs 2... 0 7 eee eae 165 
Soapstone ..j. vase periaaaes eee eee 121 
Sod, teniperature of .2./)). 22.0322 199 
DOM nots ea hs cee ve heme ee oe 104 
** absorptive power of......... =: 333 
*aid- to Oxidation a) - 9. ae eee 170 
** aqueous solution of... .309, 323, 328 
+ Condenses!Cases; 53: uaa: 165, 166 
<* Capacity for Neiaines. <a ee ees 194 
“chemical actional.. <2. ase 
** composition of.... ....... 362, 369 
“emhanstloniont aA ascsee eee BYE 
“imert Dasisr, cc. 2° 15.2.2 enie cee 
** natural strength OL iis eee one 
** origin and formation. .106, 122, 135 
“; physical characters. ... 0 .cseers 157 
=* POrOsity Of... 5375 sek ee aa eee 176 
** portion insoluble in acids..... 33) 
‘** relative value of ingredients... .367 
‘reversion to Tock... <2. 29. .saaee 
* solubility in acidss.:: 22). 2soanceee 
Ae PC eWWALOL..5.. cn ceneeeee 309 
‘** source of food to crops.........305 
“i state Of division... i...) «32.52 _ 159 
Sons MOMSMEANY: .SSss6. aa piets, 148 
S>y Stranepomeds ai tien ee 143 
2 TWIP Ole cc. shiek ol eet eee 158 
Solubility, standards of............ 308 
HOW CROPS FEED. 
Solution of soil in acids............ 370 
a = to Waber,.. cs. s5--310 
Steatite....-<:.2. Nae eemeeeere. s- .ss 121 
Swamp muck:..s sce. eee ees sens 155 
Sulphates, agents of oxidation..... 258 
Sulphate of linte. 225022. eee. 115 
Sulphur, in'deeay..-- see eee ee 0 e290 
Sulphurous acid. - 2225 2o vara ese 94 
Sulphydric*acid: 222-2 e eee te 94 
Syenite:......cdie ces easier eeee 120 
Tale... .cidiacteee ee Sea eee: 113 
Temperature of soil....... 186, 187, 194 
Transpiration. :t.2.20cev seer 202, 208 
Trap rock.) cis. ec. ceeeeeeee esas 120 
Ulmates. 200-2 eee ees beac 230 
Ulmic acid: 4.22). 8ie eee 224, 226. 229 
Ulm... 6d inns ee ea ee 224, 226, 229 
Utea.2 oic1gt ee eee 294, 277 
Uric aeid uct FER setae e 295, B77 
Brine?:: '.3.4 wus ee eee eee 293 
‘* preserved fresh by clay....... 293 
‘* its nitrogenous principles as- 
similated by plants.... .... 296 
Vegetation, antiquity of............ 138 
= GeGay Oia ete. cs... as 137 
eS action on soil.......... 140 
Volcanic rocks, conversion to soil. .135 
Wall frtite). {epee Seager 199 
Water absorbed by roots....... 202, 210 
** functions of, in nutrition of 
plant..2 3:22... Seen 216 
“imbibed by soils: ss eee 180 
‘“ movements in soil.... ..... 177 
‘* proportion of in plant, influ- 
enced by soil.) :-..3-2- 542. 213 
‘Of SOI Ae aes aes 315, 317 
eS ‘. “bottom water. i--2n0- 200 
**_ capillary’\)27-icsctssmentnes oe 200 
“ - Hydroptatiey.es.5 ee ee Pec 
‘* hygroscopic?.. Vasher ee 201 
‘* quantity favorable to crops. .214 
Water-currentss.c- nc sess one ee 124 
Water-vapor, absorbed by soil.161, 164 
“ exhaled by plants.... 99 
f not absorbed by 
plants.........85, 99 
" of the atmosphere.... 34 
Weathering. zs icy uc esiceinaeieee 131-134 
Wilting, «. °. 2, geet eer 203 
Wool, hygroseopie: ii). feoe sees 164 
Zeolites. ........ isan ep onde veueney B49 
