308 Soda-Salts in Agriculture. 



The chlorine in 41 "52 of salt contained in four deci-gullons of 

 salt-solution amounts to 25*16 grains. 



Chlorine found after contact with soil, 25"27 ; that is almost 

 precisely the same quantity originally present in the solution. 



The chlorine in the filtered liquid occurs as follows : — 



Chlorine in combination with sodium 21'19 



Chlorine in combination with potassium . . . . 'Si 



Chlorine in combination with mauncsium .. .. '35 



Chlorine in combination with calcium 3"39 



25-27 



Chloride of 

 Sodium. 



Soda. 



Before contact with soil the salt-solution contained .. 41-02 = 22-00 

 After contact with soil 34-92 = 18-50 



Difference ti-OO = 3-50 



Thus 1000 grains of pasture-land absorbed in this experiment 

 exactly 1 grain of soda — the same quantity as was taken up by 

 the soil in Experiment No. 2. 



Experiment No. 5. — Abaorption of' Chloride of Sodium on a 



Marly Soil. 



In this experiment a stifiish clay-marl was used. It was found 

 on analysis to contain in 100 parts : — 



Moisture 4-72 



Organic matter and water of combination . . . . 11-03 



Oxides of iron 9-98 



Alumina G-06 



Carbonate of lime 12-10 



Sulphate of lime -75 



Majinesia and alkalies 1-43 



Soluble sihca (soluble in caustic potash) .. .. 17-93 



Insoluble siliceous matter (chiefly clay) .. .. 3(J-00 



100-00 



The salt-solution used in this experiment slightly differed in 

 strength from that employed before, and contained, in four deci- 

 gallons, 40-32 grains of chemically pure chloride of sodium, 



3500 grains of soil, and four deci-gallons of salt-solution, 

 were employed, and the experiments carried out precisely as 

 before. 



In the four preceding analyses of the salt-solution left in 

 contact with soil, the determination of the organic matter was not 

 attempted. In this and the next experiment a separate portion 

 (one deci-gallon) of the clear liquid was evaporated, and the 

 residue carefully dried at 300^ Fahr. until it ceased to lose its 



