198 Mr. Sitiman, Jr. on the Composition of Corals. 
Porites. Porites. Madrepora. Madrepora. Madrepora. 
0, 7. No. &. No.9 dD. No.10dID. No. 11 (IV). 
Carbonate of lime 94: 438 95-000 94-807 92-815 95-086 
Phosphates and Somiden, 2-100: 1-650 0-745 ' 0-600 0-300 
Organic matter, 3-462 3-350 4-448 6-585 4-614 
Madrepora. Madrepora. Madrepora. Madrepora. Madrepora, 
No. 12 (V). No. 14. No. 15. No. 16. No. 17. 
Carbonate of lime 94-881 93-297 94-143 94-239 93-59 
Phosphates and Bestided. 0-710 2-450 0-900 0-500 0-50 
Organic matter, 4-409 4-253 4-957 5-261 591 
Pocillopora. Pocillopora, Pocillopora. Pocillopora. Pocillopora. 
No. 19. No, 20. --3.: No. 21. N No. 23. 
Carbonate of lime, 94-659 93-60 95-001 93-848 
Phosphates and fluorides, . fe 1:90. "| 1-450 0-550 1-050 
Organic matter, 791 4-50 3549 5-602 4:397 
Millepora, Heliopora. Gemmipora. capri Astrea. 
No. 24. No. 25. No. 26. 28 (VID. No. 29(VIl1). 
Carbonate of lime, 94-226 95-545 92-751 ° 93-559 96-471 
ere ane acaba 1-200 1-000 1:500 0-910 0-802 
Organic ma’ 4-574 3:455 5:749 5-536 2-727 
Astrea. Astrea. Astrea. Astrea. 
No. 30 (1X). 31 No. 33. No. 34 
Catbonate of lime, 96-551 94-810 91-782 «93-993 ora12 
Phosphates and fluorides, § 262 0-900 2:100 0-500 0-550 
Organic matter, ‘187 4-290 6-118 5-577 8-338 
A portion of the massive shell of a largé Chama, treated in a 
similar manner, afforded for 100 ~ the = aie result: : 
Carbonate of lime, 97-007 
Precipitate by lime-sater; ; 
Organic matter, 0398 
The amount of organic matter is “— very small; while the 
precipitate by lime-water is large, The examination of other 
shells with reference to this point, would have been highly in- 
teresting, and had it fallen within the scope of these researches, 
the subject would have been farther investigated. 
The per-centage of phosphates and fluorides in the above 
analyses, after excluding the organic matter, is as follows: 
: 2-600 
Specimens. he a ty Specimens. | ss re vagy Specimens. FP lnoriaen 
No. 1 (I.) 2095 |No. 12 (V.) 743 |No. 24 | 4-258 
3 0-945 14 2562 25 | 1036 
4 0-992 15 1-947 26 |. begs 
5 1-637 16 28 (VII.) 
; 0-774 17 )-537 29(VIII.), 0-825 
y 2:177 19 578 30 (IX.) | 0 
3 1-710 20 ‘990 40 
9 (IT.) 0-780 21 ‘504 33 2114 
10(IIL.)| 0-642 22(VI.)| 0-583 34 0-529 
11 ([V.)' 0-314 099 | 0-600 
