BY R. H. CAMBAGE. 



47 



latter produces a much better soil. These igneous rocks have 

 been very fully described by Messrs. E. C. Andrews, B.A., and 

 J. C. H. Mingaye, F.I.C., F.C.S.* Some figures representing 

 constituents of these rocks in other localities, taken from the 

 paper by Messrs. Andrews and Mingaye are most instructive. 



Blue Granite. Acid Granite. 



Silica (Si0 2 ) 



6536 



75-78 



Alumina (A1 2 3 ) 



16-37 



12-42 



Ferric oxide (Fe 2 3 ) ... 



1-80 



0-55 



Ferrous oxide (FeO) 



2'68 



1-08 



Magnesia (MgO) 



1*81 



0-50 



Lime (CaO) 



3'82 



1-06 



Soda (Na 2 0) 



3-40 



3-20 



Potash (K 2 0) 



375 



4-60 



It will be seen that the acid granite has a much higher 

 percentage of silica, but the blue granite possesses a greater pro- 

 portion of those ingredients which produce good soil. 



Deepwater to Stannum. 



For a few miles along the road from Deepwater to Stannum 

 the flora is sparse, much of the country having been cleared, 

 especially within the beautiful broad valley through which the 

 Deepwater River flows, but such trees as Eucalyptus tereticornis 

 Sm., E. nova-anglica Deane & Maiden, E. conica Deane & Maiden, 

 (E. Baueriana var. conica Maiden), E. viminalis Labill., Ango- 

 phora subvelutina F.v.M. (Apple), A. intermedia DC. (Apple), 

 and Casuarina Luehmanni R. T. Baker (Bull Oak), may be seen. 



The interest in regard to distribution attaches chiefly to Euca- 

 lyptus conica and Casuarina Luehmanni. The former species 

 occurs principally on the Western Slopes, extending slightly into 

 the Interior, and going almost as far south as the Murrumbidgee. 

 Its exact southern limit is not known to me. South of the 

 Lachlan it is usually found below an altitude of 1,000 feet, owing 

 to its objection to extreme cold; but in coming northwards to 

 warmer latitudes, it is found gradually ascending the valleys, 



Records Geological Survey N. S. Wales, 1907, Vol. viii. 



