76 SS. W. Johnson on some points of Agricultural Science. 
element of difference in the reactions. Natrolite however was 
not affected by digestion with chlorid of calcium. Kichhorn 
suggests that its is more firmly combined than that of 
chabazite. 
si 
a a not the — ora peters oetien. 
lcker in some valuable Tescaraben on the abso . ower 
the bases rie fs lime from soils. He found to the contrary, in 
one ee that lime was fixed and potash displaced. This 
resul well as the opposite behavior of ammonia-chabazite 
— natrolite towards solution of chlorid of calcium in ach 
cae eat number of experiments are wanted on the behavior 
of other aiesates, native ad artificial, towards saline solutions 
in various degrees of concentration, and at different temperatures, 
as well as in mixed solutions, before we can decide many _ 
esting questions suggested by these results; but we hav 
deniably an important new generalization with reference to the 
reactions that may occur among minerals and in the soil. 
Economy of the Ammonia naturally accumulated in the sotket 
Since it has been proved that enormous quantities of ammonia 
exist in soils ina state of such intimate combination that the 
usual means (boiling with fixed caustic alkalies) fails to expel 
it,* the important question has arisen—how may this ammonia 
be seedaroa. more Fase. available to vegetation than it is, so as 
in many cases to forestall the necessity for nitrogenous manures. 
. Be 
and magnesia, and silicate of potash, as well as carbonate and 
pom of lime, depend, to some degree, on reactions analo- 
to those above described! We know that very small 
* In 1855 the writer found that seria mim to the evolution of ammonia, 
hme estimate it in soils, and Dr. Mayer (Ergebnisse. . Ag. Chem. Ver- 
suche in Minchen 1 Heft.) could not reeover by boiling with caustic potash nearly 
all the ammonia he purposely added to a soil. 
