1889-90.] Dr J. Murray & Mr R. Irvine on Coral Reefs. 103 
Table III. Egg Shell (Hen's), showing the Effect of various Salts 
added to Food of Hens (Young). 
Dried at 212° Fahr. Membrane removed. 
Salts added to Food. 
No. 1. 
Sulphate 
of Lime. 
No. 2. 
Phosphate 
of Lime. 
No. 3. 
Silicate of 
Lime. 
No. 4. 
Nitrate 
of Lime. 
No. 5. 
Carbonate 
of 
Magnesia. 
No. 6. 
Carbonate 
of 
Strontia. 
Hens laid Eggs. 
Normal. 
Normal. 
Normal. 
Normal. 
Shelless. 
Shelless. 
Analysis of Shell. 
Organic matter, . 
Carbonate of lime, 
Phosphate of lime, 
Sulphate of lime, 
Silica, 
Magnesia, . 
Iron, . 
6-86 
92-03 
111 
trace 
7 7 
>> 
5*77 
93*07 
116 
trace 
77 
* 7 
7 7 
About 
same 
as in 
1 and 2. 
Same 
as in 
1 and 2. 
Table IY. Showing the Composition of Artificial Sea Waters com- 
pared with ordinary Sea Water (Young). 
Artificial Sea Waters. 
Ordinary 
Sea 
Water. 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
Chloride of sodium, . 
2-7205 
2*4804 
2*4804 
2*6996 
2*7254 
Chloride of magnesium, 
0-3794 
0-3320 
0*3320 
0*3696 
0*3813 
Sulphate of magnesium, . 
0-1551 
0*1357 
0*1357 
0*1491 
0*1660 
Bromide of magnesium, 
0*0079 
0*0076 
Sulphate of lime, 
01276 
01116 
0*1116 
0-1262 
Sulphate of potash, . 
0-1026 
0-0898 
0*0898 
0*1125 
0-0863 
Chloride of calcium, . 
0*0903 
0*0903 
0*0964 
Carbonate of lime, 
0-0120 
3-4852 
3*2398 
3*2477 
3*4272 
3*5040 
Water, .... 
96-5148 
96*7620 
96*7523 
96*5728 
96*4960 
