76 On Coral Reefs and Islands. 
centre of attraction, to visitors to the White Mountains. Since 
these mountains afford scenery of unusual interest, and as an eX- 
cursion thither is eminently conducive to health, I am anxious 
to see inducements multiplied for making this summer excursion 
more frequent. 
Arr. X{V.—On Coral Reefs and Islands ; by James D. Dana. 
Part Eighth.—With a Map. 
Geo.ogica, ConcLusions From tHE Sturcture anp ComPo- 
SITION OF CoraL Reers anp IsLanps. 
Tue geological bearing of the facts that have been detailed, 
has probably been already perceived by our readers. A brief re- 
capitulation, however, may afford a convenient review of the 
of organic life, or proofs of an organic origin. now and 
then an imbedded shell or some other relic evinces that animals 
of any kind were living in the seas is white limestone 
or in the lagoons, where the finer detritus is washed by the sea. 
A glance at the chart of the Feejees or at the Kingsmills, (a wee | 
of which, from Capt. Wilkes’s Narrative is inserted in this ae 
i ee » 
& E 3 ~. 
