240 S. W. Johnson on Nitrification. 
access of air) the whole being confined in a glass case, assii- 
ilated 00217 grm. of nitrogen, and the soil far from exhibit- 
ni tion induced by the eremacausis of its humus, with 
the formation of ozone. 
__.. he passage of nine-tenths of this fixed nitrogen into a coh 
stituent of humus, where it doubtless exists in what we , 
call organic combination, probably tuok place by reduction ° 
oe a, ‘ + € ¥ 
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