Physical Composition of Capu Colony Soils, 



99 



The results (let<iiU'<l in the forogniiii,' table may be si.Dumarised as 

 follows : — 



It will be observed that the alkaline patch, which is also chemi- 

 cally the poorest of the four in plant food, contains very much less silt 

 than the others, whereas No. 23, tb.e soil best supplied with plant food, 

 is likewise the richest in silt. 



Texture curves of the various soils, if drawn for each eight-inch 

 section, reveal to the eye at a glance more clearly than mere figures 

 can, how, on descending from surface to subsoil, in No. 21, the sand 

 diminishes in proportion, while the silt and clay increase ; in No. 22 

 sand also diminishes, while clay increases ; in No. 23 both sand and 

 clay diminish, but silt inci-eases : and in No. 24 the proportion of clay 

 increases, and there is a diminution of pebbles. 



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