APPENDIX IL 733 
Kilauea, one compact stony, of a dark gray colour (2°93), and another greenish-black 
and vitreous (2°91). The following are a few determinations of other rocks. 
Compact gray basaltic rock from Kauai. Specific gravity = 2°962. Fuses on thin 
edges before the blowpipe. 
Compact brown basalt, approaching a clinkstone, from Cockscomb Hill, Tutuila, 
(p. 810.) Specific gravity = 2-728. Fuses with difficulty on thin edges, before the 
blowpipe. 
Grayish clinkstone from Lahaina, Island of Maui (p. 231). Specific gravity = 2°66. 
At a high heat fuses on thin edges before the blowpipe. 
Clinkstone porphyry, a compact rock, speckled with flesh-coloured points, from 
Waianae Plains, Oahu, (p. 250.) Specific gravity = 2°3315, 
Syenite from Tahiti, (p. 294.) Specific gravity = 2°73. 
Chert or baked clay of Nobby, New South Wales, (p.511.) Specific gravity = 2-496. 
Infusible before the blowpipe. 
Rocks of the Bay of Islands, New Zealand, p. 439. 
In the Antarctic Voyage of Captain Ross, volume i., Appendix iii., R. M’Cormick, 
Surgeon of H. M. Ship Erebus, observes that the clay of the Bay of Islands, and else- 
where in New Zealand, rests on a volcanic substratum of trappean rocks, The cha- 
racter of the work in which the statement is made leads us to remark here, that this is 
wholly at variance with our observations, as well as those of Dieffenbach and others who 
have visited these regions. 
Australia.—(p. 449.) 
The continent of Australia has an area of about 3,000,000 square miles. Europe 
exceeds this extent by only ove-twelfth ; and the United States, before its recent Califor- 
nian acquisitions, were more than one-fourth less in area, or with these, about one-tenth 
less. 
The principal settlements are on the east, in New South Wales, commenced as a con- 
vict colony in 1788, and augmented by free settlers first in 1794;—on the west, at 
Swan River, commenced in 1829; on the south, in South Australia, at Adelaide and 
other places, commenced in 1884; and on the orth, at Port Essington, commenced in 
1838, Port Philip, on the south, north of Van Diemen’s Land, belongs to New South 
Wales. 
Age of the Coal of Australia.—(p. 495.) 
On page 495, we have alluded to the resemblance of certain Siberian coal plants to 
those of Australia, and have cited the opinions of Tchihatcheff on the age of the former. 
The following paragraph on this subject from L’Allaz Oriental, page 378, is the one 
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