E. H. BETZ 



of the nitrogen balance. After five days, a secondary increase of the nitrogen 

 excretion takes place with a still more marked negation of the nitrogen 

 balance. Adrenalectomy prevents the secondary increase of nitrogen excre- 

 tion although the nitrogen balance remains negative. 



Our results confirm the relationship between the regeneration of blood 

 cells and the metabolism of proteins. The disturbances of this metabolism 

 which follows a whole body irradiation are poorly understood. Besides 

 the hyperactivity of the adrenal cortex, there are other unknown factors 

 interfering with the nitrogen metabolism. A better knowledge of these 

 factors would probably be a great help in the discovery of the factors which 

 control the haematopoiesis of the irradiated body. 



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