REFERENCES. 
The main geological features are separated by dotted lines. 
The Basalt area being to the west and north ; the Silurian to 
the east; and the Red Sands (Tertiary) to the south-east. 
Granite areas are indicated by horizontal lines and Silurian 
by perpendicular lines. 
The annual rainfall is shown in inches. 
Volcanic vents indicated by °. 
Mountain heights are indicated in feet thus: 2077. 
The circles denote 10, 20, and 30 miles respectively from 
Melbourne. 
