BY R. H. CAMBAGE. 



685 



T am indebted to Mr. J. C. H. Mingaye, F.C.S, for the follow- 

 ing analyses of soils and quartz-porphyry from the Canberra 

 Plains, 



A. From crest of low, treeless elevation at 6;^ miles from 

 Queanbeyan. 



Mechanical Analysis. 



Coarse particles of stone ... ... ... 19 *o8 per cent. 



Stone left on 20-mesh sieve 9 "87 ,, 



Stone left on 30-mesh sieve 3 '92 ,, 



Stone left on 60-mesh .sieve 7 '83 ,, 



Root-fibre 0-59 



Chemical composition of soil passing through 60-mesh sieve 

 soluble in warm hydrochloric acid : — 



* Containing silica 78-21%. 

 t Including a small amount of Titanium dioxide (TaOj). 



B, From shallow valley at 5 miles from Queanbeyan. 



Mechanical A nalysis. 



Coarse particles of stone 0*11 per cent. 



Stone left on 20-mesh sieve 3 '07 ,, 



Stone left on 30-mesh sieve ... ... ... nil 



Stone left on 60-mesh sieve 9-38 ,, 



