410 Proceedings of the Royal Physical Society. 
peared to contain such general information as miglit interest 
the members of the Society, especially as it was accom- 
panied by specimens of the rocks and clays and maps of the 
district. Mr Smith writes : — 
" The greatest difficulty I have experienced has been to 
get a man who knew the geological names of the different 
strata ; but as your letter suggested that I should send 
home some specimens of the various strata, I shall do so by 
M'Niell, who goes by this mail, and this will relieve me 
from the difficulty. By a map of the Ballarat mining district, 
which I shall also forward, you will see accurately laid 
down by the various mining surveyors (and tinted blue) the 
various leads that have been worked and traced, and the 
quartz reefs that have been discovered (coloured red). You 
will also observe on the map the course of the Yarrowee 
creek, which runs along the foot of the high land on which 
Ballarat West is built. 
Fig. 1. — Diagram section of gruuiid on wliich Ballarat West is built. 
" There is no section on the map, but as nearly as possible 
the section from the Yarrowee up to the swamp will be as 
shown in the annexed diagram, and you will get the correct 
distance from the map. By this you will see that, instead of 
the swamp being lower than the town, it is situated on the 
highest part of Ballarat ; it is about eighty-five feet above 
the level of the creek. You will also observe, that far the 
greater number of the leads which have gone to form the 
main or Golden Point lead, have taken their rise on that 
side of the Yarrowee on which Golden Point is situated, 
the principal ones being the chain of leads beginning at 
New Chum and One Eye, and receiving many small ones 
from the east, or rather north-east, of the Golden Point, 
and White Horse ranges, called on the map Yuille's range. 
After receiving all the leads from the range, it forms a 
