-13-
Kent and McCance
(1941) have suggested that an ordinary
adult diet will supply 0.3-0.5 mg of nickel daily.
basis of these values,
On the
the nickel content of the 24-hour
Rongelapese rations appears to be higher than usual in some
cases.
Nickel salts frequently gain access to food from cor-
rosion of nickel vessels,
and small quantities of nickel may
also be found in various manufactured foods.
It also may be
that some of the native food components are high in nickel
content.
Basu and Malakar
(1940) have suggested that 4.6 mg of
manganeseare required per day to keep an adult male in manganese balance.
On this basis,
to be low in manganese.
the Rongelapese food appears
The average adult diet of good quality
supplies between 0.005-0.008 mg of cobalt daily
1952);
(Harp
et al.
in comparison the Rongelapese food appears to be fairly
high in cobalt content.
Tompsett's
(1934) balance experiments
with adult humans indicate a minimum copper requirement as low
as 0.6 mg daily.
to 2 mg daily.
The estimate of Chou and Adolph
(1935)
is 1
The Rongelapese diet is definitely above the
experimental minimum requirements given.
The iron in the diet
appears to compare favorably with the minimum daily requirement
as suggested by the National Research Council.
Eggleton
(1939)
has given normal daily intake of zinc through food as 12 mg.