92 



Report S.A.A. Advanckmknt of Scienck. 



Tlie following sclieme illustrates the entire sifting and sedimenta- 

 tion process : — 



Wet Sifting 

 and Sedimentation. 



earth 

 < 1 nnn. 



very fine 



sand 100' ^edi- 



■l-"05 mm. mentation 

 fine earth 



<i'"^"^- silt 1000' „ 



■05--01 mm. 



fine silt 24 h. „ 



•01--005 mm. 



clay in suspen- 



< OOo imn. <\on 



Kksults of Mkciiamcal Analysks. 



In most of tlie samples collected in connection with tlio agricul- 

 tural soil survey of the colony, where any mechanical separatioii at all 

 has been made, it has been only of a rudimentary description ; that is 

 to say, it has consisted simply in grading the soil into two jDortions, 

 the one comprising the "fine earth" and tlie othej- the coarser soil. 

 And yet, elementai-y tbough tliese operations have been, they have 

 elicited figures that do not entirely lack interest. For instance, if we 

 look at th<^ soils taken from th(^ south-western corner of the co]<my, 



