142 CHEMICAL COMPOSITION OF KARROO ASH. 



It must be admitted that there are great differences between 

 these maxima and minima, but, however incomplete the whole 

 investigation may be, it must also be admitted that, taken all 

 in all, the average Karroo ash is an article that deserves a far 

 more widespread employment than it receives. Large quantities 

 of it are lying practically waste in the Karroo, and, by reason 

 of its rich potash and lime content, it is just the manure, as Mr. 

 Croghan rightly said, to be used by way of supplement to the 

 guano from the Government islands, which, in its turn, supplies 

 the nitrogen that is lacking in the Karroo ash. 



In order to make this record as complete as possible, the 

 following table is appended, showing the composition, in their 

 unburnt state, of those kraal manures which were burnt not on 

 the farms, but in the laboratory : — 



