XVIII-XXI) contains large amounts of suspended and dissolved materials. 2. Green or bluish-green water is relatively clear, low in suspended matter and transmits light reflected from plant cover on the bottom. In deeper water the blue com- ponent is heightened as the longer wave lengths are selec- tively absorbed by the water, giving colors from bluish green (IV), tending toward blue (I), which is characteristic of clear, deep offshore water. 3. Apparently green water (VI-XII) contains some sus- pended matter, but it primarily reflects the color of the grass and algal cover of the bottom. The largest portion of the area falls into this range, including the grass beds between Bovoni and Cas Cays and most of the Mangrove Lagoon proper west of Bovoni Cay. 4. Clear, essentially colorless water which is not really embraced by the Forel-Ule scale, is found over clean, current-swept sand in the channels and northof Patricia Cay. I'ae 20