APPENDICES. 
APPENDIX A. 
The Stones in the Street. 
It would be hard to estimate the number of readers 
who acquired a first taste for geology by reading the Rev. 
Charles Kingsley’s “ Town Geology.” The book was a suc- 
cessful effort to teach geology to townsfolk, by study- 
ing the “ stone in the walls, the coal in the fire, the lime in 
the mortar, and the slates on the roof.” Subjects akin to 
these have been already treated of in the preceding 
chapters, with reference to the stones used for building and 
other purposes in Sydney. 
1. The sandstone used so extensively in our buildings 
is quarried from certain massive beds of the 
Hawkesbury Sandstone. For all-round building- 
purposes it would be hard to surpass this beauti- 
ful freestone. It is easily quarried, easily worked, 
hardens on exposure, and will stand all reasonable 
wear and tear. In some of our public buildings 
it is noticeable that the massive blocks forming 
the first course show a tendency to scale. This 
the writer attributes to the use of salt water — 
the one thing that the sandstones are not proof 
against — in watering the streets. It will be found, 
also, that it is probably a soluble salt in the stone 
