>'388 PROCEEDINGS OP THE SCIENTIFIC ASSOCIATION. 
latter are broken down and removed. The diagram I 
have appended will give some idea of the view I have 
endeavoured to explain. 
An examination of the volcanic and other rocks of the 
Antilles, combined with what we know of the tortiaries of 
the Caribean area, may help to clear up some obscure 
points in the history of the succession of West Indian 
'deposits. 
The diagram I have given of the structure of Dominica 
exhibits the following stages, in descending order : 
a. Newer volcanic. 
b. Coral reefs. 
62. Conglomerate. 
c. Older volcanic. 
I think it not unlikely that the conglomerate 62 is, in 
great part, contemporaneous with the coral reef formation 
to which I have already referred in the first part of this 
paper. 
If the view here set forth is the correct one, it would 
appear that two distinct periods of great volcanic activity 
are made out, in the interval between which the land was 
much depressed, and coral reefs were formed upon the 
previous volcanic accumulations. 
Subsequently there -was a re-elevation to the extent of 
200-300 feet, and volcanic materials were then deposited 
upon the coral reefs. There is no evidence of any changes 
of importance having taken place in this region since that 
time. 
The coral beds b have furnished to me the organic 
remains enumerated in the Appendix. 
The great break in the succession of life between the 
miocene and the later tertiaries of the West Indies has 
been noticed by geologists. 
