MINERALS IN NUTRITION 17 



Analysis of Ash Percent 



(Figures are percentages 

 of dry weight of kelp) 



Iodine 0.15 



Iron 0.13 



Copper 0.003 



Manganese 0.05 



Calcium 1.28 



Phosphorus 0.29 



Sulfur 1.04 



Sodium 6.50 



Potassium 12.49 



Magnesium 0.72 



Chlorine 13.67 



Total 36.323 



The work was carried on with guinea pigs, which, like man, are par- 

 ticularly susceptible to scurvy. Forty animals were used. Young 300- 

 gram guinea pigs were maintained on the Sherman vitamin C-free ration 

 supplemented daily by 2 grams of fresh Baldwin apple. The apple fur- 

 nished about half of the vitamin C requirement of the animals and simply 

 delayed the onset of acute scurvy. Ten guinea pigs showed scurvy lesions 

 in 17 days, after which they were fed various iodine supplements daily. 

 Twenty guinea pigs were similarly fed iodine supplements after 24 days. 

 Naturally the scurvy was more advanced in these animals. All the guinea 

 pigs were weighed at three-day intervals and autopsied at death. Data are 

 summarized in Table 1. 



Table 1. — Effects of Iodine Supplements on Scurvy in Guinea Pigs 



* Premature death or other causes prevented using all the animals throughout the 

 periment. 



