10 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
now above sea-level and about 200 feet below the general level of its 
well-defined rim. 
Terraced structure was certainly very plainly visible in a photograph 
by Mr. Andrews of Yathata. 
In the case of Yathata, it is probable that whatever may be the age of 
its oldest and highest limestone area, whether it be late or middle Ter- 
tiary, it has representatives of limestones in its lower terraces of various 
intermediate ages between Tertiary and Recent, as these terraces are 
probably not terraces of erosion, but terraces of growth during pauses in 
the elevation. 
That the latest elevatory movements have taken place in recent 
geological time, is proved by the freshness and good state of preserva- 
tion of the wave-worn grooves in the sea cliffs at Vatu Leile and else- 
where up to a height of 50 feet above sea-level, as detailed by Mr. 
Andrews in his notes forwarded to you. Mr. Andrews’ observations 
emphasize, I think, the need upon which you have so often insisted 
for making a separate study of each group of coral reefs and considering 
them in relation to the local geographical, biological, and geological 
conditions. 
The whole question of the exact mode of origin of the massive raised 
limestones of Fiji appears to me to be one which can only be satis- 
factorily answered by careful examination of thin slices prepared for the 
microscope of your own collections, supplemented by those forwarded 
by Mr. Andrews. 
Sypney, New Sourn WALgs, 
March 15, 1899. 
