THE ADRENAL SECRETION AND PULMONARY RESPIRATION. 129 



are totally inhibited by toxics; it is therefore the lowest of the 

 cleavage products of the hcemoglobin-molecule. 



(d) Hcemoglol)inuria, methcemoglo'binuria, and hcematopor- 

 phyrinuria indicate, therefore, successive stages of adrenal in- 

 sufficiency. 



