1889-90.] Dr J. Murray & Mr R. Irvine on Coral Reefs. 105 
Table VIII. (p. 87). Shoiving Composition of Precipitate thrown 
out of Mixture of Sea Water and Urine (after filtration from 
Precipitate which was thrown out in Seven Days), standing other 
Ten Days at 70° F. (Anderson). 
Water and organic matter, 20 *25 
Carbonate of lime, . . . . . . . . . .75*35 
Carbonate of magnesia, 1 *02 
Phosphate of magnesia, . ... . . . . . . 3*38 
100*00 
Table IX. Shoiving Saline and Albuminoid Ammonia (or Nitrogen) 
in 1,000,000 parts of Sea Water (Anderson). 
Water taken from immediate vicinity of coral islands (Louisiade Group) 
contains — 
Saline ammonia, 0*48 
Albuminoid nitrogen, taken as ammonia, . . . . . 0*18 
0*66 
Water from North Atlantic (lat. 30° 20' N., long. 36° 6' W.) — 
Saline ammonia, ......... 0*26 
Albuminoid nitrogen, . . . . . . . . 0*16 
0*42 
Water from German Ocean, near land — 
Saline ammonia, 0*13 
Albuminoid nitrogen, . . . . . . . . 0*13 
0*26 
Table X. Showing Solubilities of Various Forms of Coral , Sfc., in 
Sea Water. 
Analysts— Young and Anderson. 
Temperature 0 C. 
Exposure, in hours. 
Amount 
In 
grammes 
CaC0 3 
per litre. 
Soluble. 
In 
parts of 
SeaWater. 
One 
part in 
Coral sand, 
27 
12 
0*0320 
32,000 
Harbour mud, Bermuda, .... 
27 
12 
0*0410 
25,000 
Isophyllia dipscicea (Dana), Bermuda, . 
27 
12 
0*0410 
25,000 
Millepora ramosa (Pallas), Bermuda, 
27 
12 
0*0360 
28,500 
Madrepora aspera (Dana), Mactan Isld., Zebu, 
27 
12 
0*0730 
14,000 
Montipora foliosa (Pallas), Amboina, 
27 
12 
0*0430 
23,800 
Goniastrcea multilobata (Quelch), Amboina, . 
10 
12 
0*0730 
14,000 
Porites clavaria (Lamk.), Bermuda, 
11 
12 
0*0930 
11,000 
Melobesia, Kilbrennan Sound, 
10 
12 
0*0890 
11,500 
Oculina coronalis (powdered finely), 
10 
96 
0*0237 
42,600 
(These were in summer water from German Ocean.) 
