masXmap.hu island. 
323 
s Well, etc . — continued. 
Thickness 
Feet 
Depth 
Feet 
Tough, clay 
. 5 . 
455 
White coral rock 
. 40 . 
495 
Tough clay 
. 30 . 
525 
White coral rock 
. 100 . 
625 
Tough clay 
. 5 . 
630 
Coral and clay 
. 70 . 
700 
Tough clay 
. 28 . 
728 
Black sand 
. 2 „ 
730 
Lava . . 
. 120 . 
850 
III. Well in Thomas Square, Honolulu. 
Thickness 
Feet 
Soil 6 feet, with 6 feet of black sand, and 
clay 4 feet 16 . 
Depth 
Feet 
White coral rock 
200 . 
216 
Brown clay . . . 
44 . 
260 
Coral rock . » , 
10 . 
270 
Brown clay . . . 
60 . 
330 
White coral rock . . 
50 . 
380 
Brown clay 
80 . 
460 
Bed rock or lava, penetrated 
49 . 
509 
The evidence of these borings, which is corroborated 
by others quoted in the paper, points to a very consider- 
able subsidence in this region, to the amount of at least 
800 feet, and in all probability of considerably more than 
1,000 feet. Moreover, the ‘hard coral rock, like marble’ 
(No. I.) can hardly be anything but a ‘ fossil reef’ ; the base 
of this, it will be observed, after some upheaval, is even now 
at a depth of 825 feet (137^ fathoms), and the reef has a 
continuous thickness of 505 feet (full 84 fathoms). 
The above abstracts may suffice, I hope, to give a fair 
representation of the arguments for and against Mr. Dar- 
win’s theory, which have been advanced during the last 
fourteen years. That theory is regarded by some enthu- 
siastic opponents, as already on the threshold of the limbo 
