251 



food accessory in the yeast. The time required for these three animals 

 to regenerate their blood was 7 to 10 days. The hemoglobin values 

 were again low in two cases as for the animals which were fed no yeast 

 (table 12). The casein contained no iron but the rats were in iron-wire 

 cages and continually gnawed at the wires. 



, ; , ; TABLE 11 



Blood regeneration in adult rats after a single hemorrhage; on a diet of yeast only 



0.5 gram per day 



TABLE 12 



Blood regeneration in adult rats after a single hemorrhage; on a protein diet- 



0.5 gram casein per day 



* R.B.C. constant 3 days 



Water soluble vitamin (). Two products other than yeast, rich 

 in this dietary essential, were used as a sole nutrient for a group of rats 

 which had experienced hemorrhages. Orange juice, containing no 

 iron (by analysis and according to Sherman (13)) and tomato juice 

 containing no iron (by analysis and according to Sherman) were fed 

 to two sets of animals. The orange juice was prepared by straining a 



