126 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY 
tion of the exposure of the limestones to the conditions producing 
dolomitization. 
In conclusion it must be stated that this paper is necessarily incom- 
plete, and is only intended as a first contribution towards the chemical 
and microscopical examination of upraised coral islands. It is hoped, 
however, that the results which have been obtained may not be without 
interest to geologists, and that some of the facts may help to throw 
light on the fascinating problems which have for so long been associated 
with coral reefs. = 
