INDEX. 
Mica slate........ ... 
Minerals... 
t7 
119 
ity 
7a 
variable composition of.... 
Moisture, effect of, on temperature 
Nitrate of ammonia........... A, 73 
se Re ‘* in atmosphere. 89 
INDTREOS sa iecinciin: x, a yas ties sents 252 
By as food jor plants.......... 271 
‘© formed in soil.... ..... 171, 179 
“ In Wateris sient. ssecaiesiveses 270 
ss losS:Ofs: es.ccscscs. saves Hawa 270 
as reduction of......... 13, 82, 85 
se se “in soil......... 268 
tests for....... cece ee eee . B 
Nitric acid.... 0.0.2... 0... e eee ee eee "0 
$e * as plant-food. . .90, 98 
“ deportment towards the ’ 
BOIL sarsiscisiovarataacciaroqaterers 357 
- ‘© in atmosphere........... 86 
ye rain-water... 
Co FE Belkin. ccgwanaeey 
“« « «&  & sources of. 
Nitric oxide...” 
Nitric peroxide. 
Nitrification............. 
me conditions of.... 
265, 292 
Nitrogen, atmospheric supply to 
plants.............66 95 
“ combined, in decay .291, 292 
se oe of the soil...2' 
ae combined, of the soil, 
available. .........+.. 283 
ene combined, of the soil, 
(GK. we caeeeces cece 278 
a combined, of the soil, 
quantity needed for crops.288 
ee free, absorbed by soil.. .167 
se “ assimilated by the 
BON 5 ocinsiaajesaionie 259 
es “in soil..,......---+- 218 
ee * not absorbed by 
vegetation..... 26, 99 
is not emitted by liv- 
ing plants........ 28 
Nitrogen-compounds, formation of, 
in atmosphere.%5, '(7, 83 
XII 
Nitrogenous fertilizers, effect on 
cereals... 83 
Nitrogenous organic matters of soil.274 
Niteous-aeld 25 cocks ewes cavavs.« 
Nitrous oxide.... .. 
Oxidation, aided by porous bodies. 
169, 170 
Oxide of iron, acarrier of oxygen, .257 
se ss hydrated, in the soil.350 
Oxys gen, absorbed by hag sew sees: 9B. 
essential to growth. . 
cy supply 
weathering action of. 
“concerned in ‘oxidation of ni- 
TOTEN, ges sewn dais O55: 82 
‘* formed by chemical action.66, 67 
‘* produced by vegetation.67, 84, 99 
** relations of, to vegetable nu- 
trition............ Bjateatseeian 0 
Pan, composition of.. 
Parasitic plants, nourishment of... 235 
POAC: 5:5 iccsferaseinansd ondis Sosietey Sioa 155, 224 
* nitrogen of... 1 Qh 
Phosphate of lime......... 116 
Phosphoric acid fixed by the soil. . .35% 
oe ** presence in soil 
water.......... 815 
Phosphorite...............00c00 wee 116 
Plant-food, concentration of........ 320 
te maintenance of supply .871 
Platinized charcoal............ ... 170 
Platinum sponge, condenses oxygen170 
POPPLYTY! weiss ccsiicie sd esgaesc saavviees 120 
Potash, quantity in barley crop.....363 
Provence, drouths of.......... 198 
Pyrites.... 115 
PYTOKCNC. 6: oie:sc ois voice sist oieine ve 112 
“ 
nitric acid in.. 
is phosphoric acid in 
Ree Ree bottom, soil of..... os 
Respiration of the plant............ 43 
Rocks sciceaaserenpie ta wstanes: 106, 11% 
“ attacked by plants. ....200+2.140 
