I posted I Found Rachel in the 1852 California Census yesterday, and noted that I now knew where in Australia that Jane Whittle (1847-1921), my wife's great-grandmother, was born. The 1852 California State Census included children Elizabeth (age 13), Joseph (age 9) and Jane (age 5) were in San Francisco with their mother Rachel Wadle (age 32).
From Jane's death certificate, I "knew" that her parents were Joseph and Rachel (Moore) Whittle, both born in England, and who came to San Francisco in about 1850 from Australia, so this is the right family in the 1852 Census.
Reader Rod Van Cooten kindly offered the website http://www.bdm.nsw.gov.au/cgi-bin/Index/IndexingOrder.cgi/search?event=births (the New South Wales Registry of Births, Deaths and Marriages) to check for the Births in New South Wales.
I did check - here is the Births page, where I put in Last Name = Whittle and years 1838 to 1850:
And here are the results:
Not only that, but the New South Wales Birth Register reveals three other children of Alexander and Rachel Whittle - William in 1842, John in 1845, and Margaret in 1849. So now I know that there were at least six children born to Alexander and Rachel Whittle. What about Deaths? The NSW Death Index lists infant William A. Whittle in 1842, so that accounts for him. Since John and Margaret are not in the 1852 California Census with their mother, it seems that they likely died in Australia, on the trip to the USA, or in California before the 1852 Census.