686 



NOTES ON THE NATIVE FLORA OF N. S. WALES, X., 



Chemical composition of soil passing through 60-mesh sieve 

 soluble ill warm hydrochloric acid : - 

 Insoluble in acid 

 fFerric oxide alumina ... 



Silica (SiO.,) 



Lime (CaO) 



Magnesia (MgO) 



Potash (K2O) 



Soda (Na.,0) 



Phosphoric anhj'dride (P„Oji)... 

 Manganous oxide (MnO) 



Water 



Organic matter ... 



* Containing silica 76-62%. 

 t Including a small amount of titanium dioxide (T.^O.J. 



The major portion of the soil which passed through a 60-mesh 

 sieve, and used for the analysis, consists of fine particles of 

 broken-up stone 



No. 2124/18. Quartz-porphyry, Canberra Road, on treeless 

 plain 2| miles from Queanbeyan. 



Chemical Composition. 



Moisture at 100°C 



Water above lOO'C 



Silica (SiOa) 



Alumina (AloO-) 



Ferric Oxide (Fe.,03) 

 Ferrous oxide (FeO) 

 Manganous oxide (MnO) ... 

 Nickel and cobalt oxides 



(NiO-CoO) 



Calcium oxide (CaO) 

 Magnesium oxide (MgO) ... 

 Barium oxide (BaO) 



Strontium oxide (SrO) 



. present" 



99-81 



* Spectroscopic reaction only. Specific gravity of rock -2-735. 



The soils of these plains around the Federal Capital are sili- 

 ceous rather than basic, and the feature which is noticeable at 

 Canberra, and other similar plains, is, that if there are any con- 



