INTROD UCTO R V NOTICE. 
The First Edition of tlic following Memoir was written for and published in 
the “ Catalogue of the Natural and Industrial Products of New South Walesf 
arid forwarded to the Paris Universal Exhibition of 18G7 by the New South 
Wales Exhibition Commissioners, at whose request it was undertaken. 
It was re-printed at Melbourne in the “ Official Record of the Intercolonial 
Inhibition of Australasia ” in the same year, and was subsequently honored 
by being transferred to the .pages of the “ American Journal of Science and 
ArtP 
The Second Edition was prepared for the “ Report of the Intercolonial 
Exhibition of 1870, at Sydney,” and was included with an Essay “ On the 
Progress of Gold Discovery in Australasia f rom 18G0 to 1871 ” (by the same 
author) in the work entitled, “ The Industrial Progress of New South 
Wales 
The Third Edition carried on the mention of Geological experiences as to the 
Sedimentary Eormntions of Australasia to the year 1875, and had reference 
to the Philadelphia International Exhibition of 187G— of the New South 
Wales Commission for which, and of those of the years nbovenamed, the 
author had the honor of being a Member. 
The present (or Fourth) Edition continues the. Progress of Geological 
investigation up to date, and contains much fresh information. It is dedicated 
with great respect to the Congress of Geologists assembled at Paris in 
connection with the International Exhibition of this year. 
IJranthwaite, North Shore, 
2 June 1878. 
(quo die oclogenarius) W.I3.C. 
