"THORIUM B" IN BLOOD VOLUME STUDIES 



591 



Table 3. — ThB Content of 1 gm of 

 Fresh Plasma. Expressed in Percentage 

 OF THE ThB Content of 1 gm of Fresh 

 Corpuscles, after Incubation of the 

 Active Blood for 20 Minutes at 37° C 



Time in minutes of tlie 

 passage of the thoron 

 stream before incubation 



Percentage of ThB present 

 iu phisma 



Distribution of ThB Between Red Corpuscles and Plasma 



Immediately after leading thoron-charged oxygen for 20 minutes 

 through a blood sample, the ThB content of 1 gm of fresh plasma is 

 found to contain 4 per cent of that of 1 gm of red corpuscles. If we 



Red cells 



Plasma 



12 3 4 



Hours elapsed afrer injection of active plasmc 



Fig. 8. Uptake of thorium B by red cells following injection 



of labelled plasma. 



