_Potash in Fertilizing Materials and Fertilizers_, pp.
248-266.—Introduction; Forms of potash; Organic sources of potash;
Tobacco stems and waste; Cottonseed hulls and meal; Wood ashes;
Fertilizing value of ashes; Sugar beet molasses; Residue of wineries;
Destruction of organic matter; Ignition with sulfuric acid; Potash in
mineral deposits; Occurrence and history; Changes in potash salts _in
situ_; Kainit; Carnallit; Polyhalit; Krugit; Sylvin; Sylvinit;
Kieserit; Schönit; Potassium sulfate; Potassium magnesium carbonate;
Potash in factory residues; Quantity of potash salts used.
_Methods of Analysis_, pp. 266-289.—Classification of methods;
Platinic chlorid method; Official method; Alternate official method;
Solution of organic compounds; Factors for calculation; Halle potash
method; Dutch method; Swedish method; Method of the German Kali
syndicate; Method for high grade potash salts; Barium oxalate method;
de Roode method for kainit; Calcium chlorid method; Rapid control
method; Determination from metallic platinum; Errors in platinum
method;Effect of concentration on accuracy; Differences in form of
crystals of potassium platinochlorid; Recovery of the platinum
waste.
_Estimation of Potash as Perchlorate_, pp. 289-301.—General
principles; Caspari’s method of preparing perchloric acid; Kreider’s
method; Keeping properties of perchloric acid; The analytical process
for determining potassium as perchlorate; Removal of sulfuric acid;
Applicability of the process; Accuracy of the process; Authorities
cited in Part Third.