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L O
The earth is surrounded by g
with it
and collectively are termed the atmosphere
to the weight of its componen t pa
close to the su
r easing distanc
inc
substances of the atmo sphere of special impor tance in
ilviculture are
chief constituents of the atmosph
oxyg
n and
chemical pro cess i s requi
nitrogen
as a matter of fact
faculty of taking oxygen f
ing into a ch
bodies are the soil
comparatively late date it was believed that plants could not
take nitrogen di
r tain plan ts
that ce
r t h er investigation will doubtlessly lead to additional
and fu
r i
discove
s in t
lthough the leaves of plants take up oxygen
r quantities of it under t h e ef
greate
result of t
l
aves
which retain the carbon and su
h us
T
plants a
h e action of
T
the evaporation of moisture and the decomposition of organic
r
h e ai r which penetrates into t h e fi ssures and inte r
matte
T
of
IT Y
AL
TI
r face of the
fro
xygen and
arbon dioxide
M oi stu r e
olid bodi
mmonia and
parts of nit
r om the atmosphere
mical combination with it
leaves
r ect f r om t h e air
includi
h is respect
h e d ecomposition of carbon dioxide by t h e
r e powe r ful ag
air in the soil is chiefly two
soil b
com
s cha
O
V
T
a seous bodies
r ts
the atmosphe
arth
and become s thinne
itrogen
s
itric
cid
D
I T
N AN
r ogen in a mechanical mixtu r e
r ed to separate oxygen from
all porous bodies possess the
r k
ba
and roots of plants
It has now b
g various forest t
ct of light
nts in the p
r ged wit h vapour and carbo n
G
T
TI O
which move
r e is dens
r adually into space
g
N
r e
without ente
mongst such
r ees
can do this
they exhale
the l
r rende r the oxygen
r oduction of oxygen
fold
wing
st
r with
r ts of
pa
r
U
ntil a
r oved
en p
a tter is
it causes
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