THE WATER SUPPLY OF SYDNEY. XCVII. 
is to be allowed for run off, which I think a fair average all 
the year round, we shall require a rainfall of 116 inches, 
which is 140? above the average, and is more than the sum 
of all the rainfall for 1905-6-7. In the latter case the rain- 
fall of the wettest year in the record (1860) would not fill 
the dam, if no water were drawn off, but the combined 
rainfalls of the two consecutive wettest years (1860-1) 
would do so. An interesting feature of the diagram are 
the three dry periods, the first 1880-1886 seven consecu- 
tive years; the second 1894 — 1898, five consecutive years; 
and the third 1901—1907, seven consecutive years; the 
previous years of the record of 75 years shewing nothing 
similar. 
Mr. H. DEANE dealt- specially with the population and 
rate of increase: 
The Statistician’s figures for 1901 were 491,222 
Mr. Keele’s figures st, sts ... 496,960 
Difference 5,742 
Statistician’s figures for 1902 ... ... 016,540 
1903 ... nee Od O00 
1,037,540 . 
Mean 518,770 
Mr. Keele’s figures 1902-3 ae ... 023,000 
Difference 4,230 
Statistician’s figures 1906 ny: ... 906,830 
1907 ae Me DA AaOO 
1,134,010 
Mean 567,005 
Mr. Keele’s figures for 1906-7 a) G0 S-ONG 
Difference 36,905 
