1888.] Mr W. G. Reid on Carhonate of Lime in Sea Water. 155 
The accompanying table gives the results of the experiments. The 
columns of the table are explained by the headings, and Mr Murray 
adds the following notes with reference to the contractions used in 
column (c). 
Globigerina Ooze. — Collected on the 21st March 1876, in the 
South Atlantic. Lat. 21° 15' S. ; long. 14° 2' W.; depth, 1990 
fathoms. 
Specimen /., consists of the larger shells in this deposit, such 
as the shells of the Pelagic Globigermidse, such as Orhulina 
universa, GloUgerina liustigernia, Splieroidina, Pullenia, Pul- 
vinulina. In addition to these there were the shells of a few 
bottom living Poraminifera, as Biloculina, and fragments of 
Echinoderms, Lamellibranchs, and otoliths of fish. The average 
size of the shells and particles in this specimen is about *6 of a 
millimetre. 
Specimen //., consists of the smallest shells in the same deposit, 
being almost wholly made up of young shells of the above mentioned 
Globigermidse. The average diameter of the grains of this fine sand 
are less than T of a millimetre. 
Coral Sand. — Collected off the Great Barrier Reef of Australia 
on the 31st August 1874. Lat. 11° 35' 25" S. ; long. 144° 2' E.; 
depth, 135 fathoms. 
Sample /., consists chiefly of the coarser fragments of these 
deposits, and is made up of particles of broken Pteropods, Gas- 
teropods, Lamellibranchs, Echinoderms, Polyzoa, SerpuliB tubes, 
and numerous Poraminifera, The average size of the fragments 
were from 2 to 3 millimetres in diameters. 
Sample II. This was a sample from the same deposit, and made 
up of the same kind of fragments as Sample L, but these were con- 
siderably smaller in size, 
Pteropods. — These consisted of the shells of Cavolinia clio^ 
Cuvierina^ Limacince, and shells of Atlanta. These were com- 
plete, or nearly complete shells, and apparently free from sand 
and mud, and were picked out from the coral sand above men- 
tioned. 
The last column in the table (column^?) contains the results stated, 
so as to render all the experiments comparable. Taking these figures, 
we have the following average results : — 
