258 Papers from the Department of Marine Biology. 



at 8.2 while it was agitated with calcite crystals, the loss of CaCOs 

 would be about 0.001 N, or 0.0005 M, or 0.1 gram per liter. This 

 would cause a deposit of 10 kg. per square meter of bottom in water 

 100 meters deep. This would cause a lowering of the total calcium 

 content of Tortugas sea-water by about 4.5 per cent. 



The actual precipitation of CaCOs was most noticeable in the Mar- 

 quesas lagoon. At 4 p. m., July 30, the pH was 8.46 and there was a 

 precipitate of CaCOs coming down in the water and incrusting the 

 eel-grass. 



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