170 ANALYSIS OF SOILS. 
precipitate of oxalate of ammonia, Filter, and add 
to filtrate an excess of solution of ammonia and arseni- 
ate of ammonia: this will cause the separation of 
magnesia present. Filter—the clear liquid will now 
contain the alkalies potash and soda, Heat it to dry- 
ness and dissolve the residue in afew drops of water, 
and add an excess of a solution of bichloride of pla- 
tinum, then heat again to dryness, dissolve the resi- 
due in distilled water and filter. What remains in 
the filter is a double salt of potassium and platinum, 
dry and weigh, 100 parts is equal 19°26 of potash. 
fake 100 grains of the dried soil, digest and boil 
in hydrochloric acid and add ammonia as in last ex- 
periment, collect the precipitate on a filter and wash 
it with boiling distilled water. Now dissolve the 
precipitate in dilute nitric acid. Add to it an excess 
of a solution of molybdate of ammonia, and apply a 
gentle heat to the mixture for 24 hours, the preci- 
pitate will contain all the phosphoric acid in the spe- — 
cimen. 
Epwin L. Kocu. 
[We fear that the vast majority of the planters will 
be unable to follow the processes, but under the belief 
that a few here and there may find the recipe use- 
ful for themselves and their neighbours we give it.] 
