In 1889 evidence was laid before this Society by Mr. W.
F. Petterd and myself, demonstrating the existence in
Tasmania of two centres or districts characterised by
eruptive rocks derived from elaeolitic and theralitic magmas.
I now submit further localities for rocks belonging to the
same great felspathoid series. One of these is the Table
Cape Bluff, near Wynyard, on the North-West Coast, and
another is the Nut at Circular Head. A third is One
Tree Point, Sandy Bay, near Hobart, where melilite, basalt
has been identified, but only the first two will be dealt with
in these notes
