HAT GUANO IX KHODKSIA. 



105 



one sample being" as low as 013 per cent., whereas in another 

 29()8 per cent, was obtained. In the majority of deposits, 

 with few exceptions, bat g-uano is very deficient in potash. 



The results of analyses of niimerons samples of bat g'liano 

 deposits, even from the same locality or cave, indicates that 

 the material varies g-reatly in composition. The following- 

 analyses will clearly illustrate the variations in composition : — 



Average Composition of Bat Guano^Soutiiern Eiiodesia. 



The minimum, maximum and average composition of 

 samples analysed from Southern Rhodesia is as follows : — 



■*"• Caloulateci on forty-five samples. 

 + Calculated on twenty-six samples. 



The following' are the analytical results of samples 

 analysed in the laboratory. 



The samples have been classified as (a) nitrog-enous bat 

 g-uanos, (b) phosphatic bat guanos, and (c) inferior bat 

 guanos. Included in the last classification are those that do 

 not pass the standard as laid doAvn in the Fertilisers Ordinance 

 lieerulations. 



