highest specific gravities are found at the 100- to 200-meter levels, 

 Icwer readings being obtained both at greater and at lesser depths). (See 

 the accompanying table of operations. ) 



Maxi mum, Mniniun and Averarje Specific Gravities at Each Le^re 1 



(3) Hydrogen Ion Concentration 



At six stations near -Toleai the hyd-^ogen ion concentration 

 varied from 3.3 to 3.5 for the surface and 25-mfter levels, 3.4 at the 50- 

 and 100-meter levels, and 8.1 to 8.4 at 200 and 300 meters. As for 

 vertical distribution, four of the six stations shovred decreasing concen- 

 trations at lower depths. Observations at one of the other two stations 

 showed identical strata while at the other the strata were irregular. 



This indicates that in the v/aters adjacent to '.Voleai tb.e hydrogen 

 ion concentration decreases as the depth increases. The variation as 

 bet'veen the surface and the lOO-rneter level is comparatively slight, but 

 at greater depths a marked lowering of basicity is seen. (See the 

 accompanying table' of operations.) 



(4) Water Color and Clarity 



Water color was determined by t?ie use of T^'orel's standard 

 fluid. The results of 14 observations showed that in the area between 

 Woleai and Lamotrek the water color is generally No. 2 or No. 3 on the 

 Forel scale. No. 3 predominated, No. 2 being observed at only two sta- 

 tions, both near Ifalik (Stations J and K). That is to say, in the area 

 between Woleai and Lamotrek the water color in the areas east and west 

 of the waters surrounding Ifalik Is. was No. 3. 



A white disk 33 centimeter b in diameter was employed to measure the 

 clarity of the sea water. The disk was sunk in the water and the depths 

 at which it could be seen T.rera measured. Combined results of 11 observa- 

 tions give a maximum visibility of 35 meters and a minimum of 27 meters, 

 the average being 31 meters. In general it is worthy of note that the 

 visibility was greater west of '.feleai than it was to the east of that 

 island. 



17 



