412 PACIFIC OCEAN. 
FEET. 
Feiss - - - - = - = = E : ¢ Z 90 
Pelews, - - - - - - = : 2 2 = 02 
New Hebrides, New Caledonia, Salomon Islands, - - - none ascertained. 
Several deductions are at once obvious :— 
1. That the elevations have taken place in all parts of the ocean. 
2. That they have in some instances affected single islands, and not 
those adjoining. 
3. That the amount is often very unequal in adjacent islands. 
4. That in a few instances the change has been experienced by a 
whole group or chain of islands. The ‘larawan Group is an instance, 
and the rise appears to increase from the southernmost island to Apia, 
and then to diminish again to the other extremity. 
The Feejees may be an example of rise at the west side of a group, 
and possibly a subsidence on the east; while a little farther east, the 
Tonga Islands constitute another extended area of elevation. We ob- 
serve that while the Samoan Islands afford no evidences of elevation, 
the Tonga Islands on the south have been raised, and also the Fakaafo 
Group and others on the north. 
We cannot, therefore, distinguish any evidence that a general rise 
is or has been in progress; yet some large areas appear to have been 
simultaneously affected, although the action has often been isolated. 
Metia and Elizabeth Island may have risen abruptly : but the changes 
of level in the Feejees and the Friendly Islands, appear to have taken 
place by a gradual action. 
3. CHANGES OF LEVEL IN THE PACIFIC PRECEDING THE CORAL REEFS. 
The evidences of change of level previous to the growth of coral 
are to be looked for in the topographical features of the high islands, 
and the occurrence of conglomerate layers of rolled stones in the 
structure of the mountains. 
To arrive at any general results on this subject requires, therefore, 
a thorough knowledge of the surface of the islands, as well as their 
interior structure: and as regards the last-mentioned point, the soil 
and vegetation over these tropical lands is everywhere an obstacle in 
the way of investigation. Our own surveys have led to few results, 
and these can be stated in a single paragraph. 
In our account of the island of Oahu, we have mentioned the 
occurrence of layers of rounded stones and earth interstratified with 
