woe 
S. W. Johnson on some points of Agricultural Science. 7 
numerous recent and carefully conducted experiments with ma- 
being literally possible to show from the experience of the farm 
that almost every fertilizer in use has in some instances proved 
beneficial to every cultivated crop, and in other cases has been 
indifferent or even detrimental. 
We are therefore compelled more and more to regard the in- 
_ direct action of manures, and the principle brought out by the 
hes of Way and Eichhorn, appears adapted more than any 
~ other yet discovered to generalize the phenomena of indirect 
action, and enable us to foresee and explain them. Proofs are 
not wanting of the actual operation of this principle in the soil. 
Wolff @ age 
ashes of th e part of that plant grown on the same soil 
minus this addition, contained less chlorid of sodium but much 
more chlori ving occurred an exchange 
of bases in the soil. 
