318 Proceedings of Royal Society of Edinbui^gh. [may 7, 
Table I . — Solubility of Carbonate of Lime, under different forms, in Sea Water 
in grammes, per litre. 
Material used. '> 
I 
■’ Temperature. 
Exposure." 
Mean Amount of 
CaCos taken up. 
Number of Deter- 
minatious made. 
Dead eorals, porites, 
°C. 
27 
Hours. 
12 
Gram. 
0-395 
3 
Coral sand, ..... 
27 
12 
0-032 
5 
Harbour mud, Bermuda, 
27 
12 
0-041 
2 
Isophyllia dipsacea (Dana), Bermuda, 
27 
12 
0-041 
6 
Milleporaramosa Bermuda, 
27 
12 
0-036 
7 
Madrepora asperafDdJio), Mactan Isld., Zebu, 
27 
12 
0-073 
7 
Montiporafoliosa{VQ\\diB), Amboyna, 
Goniastrcea multilobata (Quelch), Amboyna, 
27 
12 
0-043 
7 
10 
12 
0-073 
3 
Porites clavaria {hdimk.), Bermuda, 
11 
12 
0-093 
2 
Table II. 
Material used. 
Temper at me. 
Exposure. 
S s 
§1 
rH O 
Number of Deter- 
minations made. 
W eatliered oyster shells. 
°c. 
10 
Hours. 
12 
Grms. 
0-331 
3 
Mussels allowed to rot in sea water 7 days, . 
17 
168 
0-384 
2 
1 Lobsters allowed to rot in sea water 3 weeks. 
10 
504 
1-062 
2 
Shrimps allowed to rot in sea water 3 weeks. 
10 
504 
1-047 
2 
Schizopoda allowed to rot in sea water 3 weeks. 
10 
504 
0-782 
2 
Crystallised carbonate of lime. 
10 
12 
0-123 
2 
a Amorphous carbonate of lime (freshly pre- 
pared), ..... 
10 
0-649 
2 
b Ditto ditto ditto 
~l-66 
0-610 
2 
Melobesia, Kilbrennan Sound, Scotland, 
10 
12 0-089 
3 
a and b, the carbonate of lime was added as long 
as it dissolved. 
Geoege Young, Analyst. 
The solution thus formed, on standing, throws down a consider- 
able proportion of carbonate of lime in a crystalline form. This 
may either be due to the loss of carbonic acid, or to the formation 
of ammoniacal salts (due to the decomposition of the nitrogenous 
organic matter), which decreases the solubility of carbonate of lime 
in a most marked manner. 
We notice a similar result when amorphous carbonate of lime 
