296 SELENIUM 



saline, and reinjected into other ducks, each recipient getting about 

 1.74 X 10^ counts/min. These ducks were bled at various intervals up 

 to 10 days, and the amount of red-blood-cell activity determined as 

 described in (Se-2). 



Se-1. Heinrich, Max, Jr., and F. E. Kelsey: Selenium Metabolism: Loss of Selenium 

 from Mouse Tissues on Heating, Federation Proc, 13 : 364 (1954). 



Se-2 McConnell. Kenneth P., and Betty J. Cooper: Distribution of Selenmm m 

 Serum Proteins and Red Blood Cells after Subcutaneous Injection of Sodmm 

 Selenate Containing Radioselenium, J. Biol. Chem., 183: 459-466 (1950). 



Se-3 McConnell, Kenneth P., O. W. Portman, and R. H. Rigdon: Intravascular 

 Life Span of the Duck Red Blood Cell as Determined by Radioactive Selenium, 

 Proc. Soc. Exptl. Biol. Med., 83: 14(3-143 (1953). 



