Old-fashioned child: A child that acts old for their age.
Americans would say `Precocious'.

'Possum: In Australia, a class of marsupials that were originally
mistaken for possums. They are not especially related to the possums
of North and South America, other than both being marsupials.

Public/Pub.: The traditional pub. in Australia was a hotel
with a "public" bar -- hence the name. The modern pub has often
(not always) dispensed with the lodging, and concentrated on the bar.

Tea: In addition to the regular meaning, Tea can also mean
a light snack or a meal (i.e., where Tea is served).
In particular, Morning Tea (about 10 AM) and Afternoon Tea (about 3 PM)
are nothing more than a snack, but Evening Tea (about 6 PM) is a meal.
When just "Tea" is used, it usually means the evening meal.
Variant: Tea-time.

Tucker: Food.

Shout: In addition to the regular meaning, it also refers to buying drinks
for all the members of a group, etc. The use of this term can be confusing,
so the first instance is footnoted in the text.

Sly-grog-shop: An unlicensed bar or liquor-store.

Station: A farm or ranch, especially one devoted to cattle or sheep.

Store Bullock: Lawson makes several references to these.
A bullock is a castrated bull. Bullocks were used in Australia for work