530 ADVENTURES IN RADIOISOTOPE RESEARCH 



Summary 



A simplification of the method of determination of the red corpuscle content 

 previously communicated is described. 



A blood sample taken from a rabbit is shaken in the thermostat at 37° for 

 about 2 hours in the presence of labelled sodium phosphate and, then, it is rein- 

 troduced into the circulation of the rabbit. A comparison of the total labelled 

 phosphorus content (radioactivity) of the corpuscles injected with the total label- 

 led phosphorus content of corpuscle samples secured, few minutes after the injection 

 took place, leads to the value of the red corpuscles. 



The red corpuscle content of the rabbits investigated varied between 20.5 and 

 26.5 gm per kgm of rabbit weight. 



References 



J. Barcboft (1934) Features in the Architecture of Physiological Functio7i. London. 

 L. Hahn and G. Hevesy (1940) Acta Physiol. Scand. 1, 1. 

 L. Hahn and G. Hevesy (1941) Ibid. 2, 347. 

 L. Hahn and G. Hevesy (1942) Ihid. 3, 1£03. 



P. F. Hahn, W. M. Balfour, J. F. Ross, W. F. Bale and G. G. Whipple (1941) 

 Science 93, 87. 



