290 
PACIFIC SCIENCE, Vol. VII, July, 1953 
limitations of the instrument, attempts were 
then made to measure the color intensities 
with a Beckman spectrophotometer, model 
B. With neither instrument were the tests or 
the measuring apparatus sufficiently accurate 
to give reliable results with the low concen- 
trations of these salts present. 
Inorganic phosphates were analyzed by a 
modification of the method of Deniges (as 
reported by Robinson and Thompson, 1948^: 
33-41). From the attempted analyses it can 
be concluded that no samples taken during 
the year greatly exceeded the value of 0.50 
mygram atoms per liter and that it is likely 
that most values were lower. 
Nitrites were analyzed by a method origi- 
nally developed by Peter Griess and later modi- 
fied by Ilosvay (as reported by Robinson and 
Thompson, 1948^.' 42-48). None of the sam- 
ples taken throughout the year gave measur- 
able amounts of nitrite; therefore, the nitrite 
was either almost entirely absent from the 
waters or at least fell consistently below 0.10 
mygram atoms per liter. 
Silicates were analyzed by a modification 
of a method made practical by Dienert and 
Wandenbulcke and first applied to oceano- 
graphic investigations by Atkins (as reported 
by Robinson and Thompson, 1948c.' 49-55). 
With regard to the silicates it can be stated 
that no samples taken during the year greatly 
exceeded the value of 10 mygram atoms per 
liter and that it is likely that most values were 
lower. 
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