-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.