30G Soda-Salts in AfiricuUurc. 



through the soil is 25-42, which is divided amongst the four 

 chlorides as follows : — 



Chlorine in union with sodium 21-13 



Chlorine in union with niaiinesium TOl 



Chlorine in luiion with jjotassium "Si's 



Chlorine in union with calciiun 2-43 



25-42 



This corresponds almost exactly with 25*16 — that is, the quantit}' 

 of chlorine in the 42-51 {grains of salt contained in four deci- 

 <2^allons of the solution employed in these experiments. 



In this case a little more soda was absorbed than in the pre- 

 ceding experiment : — 



OhloriJe of g^ 



Sodium. 



Before the experiment the salt-sohition contained .. 41-52 = 22-00 



After contact with soil 34-88 = 18-48 



Dinerenco C.-Cl = 3-52 



1000 grains of soil consequently absorbed 1-057 grain of 

 soda. 



Experiment No. ?y. — On a fertile Sandy Loam. 



This soil on analysis yielded the following results: — 



Moisture 2-05 



Organic matter and water of combination . . . . OTo 



Oxides of iron and alumina fi-lO 



Carbonate of lime 1-22 



Alkalies and magnesium 1-20 



Insoluble siliceous matter (sand and clay) .. .. 82-22 



100-44 



The qualitative analysis of this soil showed, moreover, that it 

 contained distinct traces of chloride of sodium. 



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

 tivated as before with the following results : — 



The clear fdtrate after contact with the soil contained : — 



<Jrains. 



Soluble silica -12 



Oxides of iron and alumina "20 



Chloride of sodium 37-36 



Chloride of potassium 1-72 



Chloride of magnesium "30 



Chloride of calcium 4-60 



Sniphate of lime -06 



riidsphoric aciil traces 



45-26 



Tlio fjltmt'' con|;iined, in ronforinity with Experiment No. 1, 



