A. Section of normal adrenal of a dog. B. Section of adrenal of a dog after injection 

 of diphtheria toxin. C. Section of adrenal of a dog after injection of diphtheria toxin 

 plus morphin. D. Section of adrenal of a dog after injection of diphtheria toxin and 

 the continuous administration of nitrous oxid for four hours. 



FIG. 75. PROTECTIVE EFFECT OF MORPHIN AND OF NITROUS OXID ON THE ADRENALS 

 OF DOGS WHICH HAD RECEIVED INJECTION OF DIPHTHERIA TOXIN. 



Note the general disappearance of cytoplasm and nuclei in B and compare with the 

 normal appearance of C and the conserved nuclei in D. (From photomicrographs, X 1640.) 



