SKEATS: CHEMICAL COMPOSITION OF LIMESTONES. 99 
dirt lines round the margins of the organisms, the interior being 
recrystallized calcite. 
No. 211. Most of the slide is occupied by the section of a coral, 
whose spaces are filled partly with “mud,” partly with aragonite crystals 
continuous with the coral fibers, and partly with clear calcite. 
No. 209. Large coral fragments and other organisms make up the 
bulk of the rock, and are cemented together by a deposit of fibrous 
calcite crystals. 
NORTH OF 
* |Carbonate.| Carbonate. | Residue. _ FLYING FISH COVE. 
| 
Height Calcium |Magnesium /Insoluble 
First Invanp CuIrFr. 
No. 208. Coral fragments, sections of lamellibranchs, and other or- 
ganisms, including several specimens of Globigerina, are set in a matrix 
of dark calcareous “mud.” In one part of the slide fibrous calcite in- 
vests the organisms. 
No. 202. A limestone with a muddy matrix, containing coral frag- 
ments and many specimens of Globigerina. Muddy, fibrous incrusting 
crystals of calcite invest some fragments. 
No. 200. A limestone, largely composed of coral fragments, with 
aragonite crystals in some cavities. A large amount of fibrous cement- 
ing calcite occurs. Round Lithothamnion, scalenohedral crystals were 
first formed, and then an outer layer of fibrous calcite, while a plate of 
calcite has surrounded an echinid spine, the deposited material being 
in optical continuity with the calcite of the organism. 
SoutH-East oF PHospHate Hint. — Below the second inland cliff 
another cliff occurs between the heights of 200 and 300 feet, which 
forms the newer fringing reef in this part of the island. 
VOL. XLIT. — NO. 2. “4 
