174 MAN --AN ADAPTIVE MECHANISM 



tones, of iodin, of thyroid extract, of adrenalin, of acids 

 and alkalis. We examined the organs and tissues of 

 animals from which the adrenals, the pancreas or the 

 liver had been excised ; the organs of animals given 



A. B. 



Liver of salmon from ocean. Liver of salmon from headwaters 



of Columbia River. 



FIG. 32. EFFECT OF A LONG SWIM ON THE LIVER OF A SALMON. 



Note the eccentric position of nuclei, disappearance of cytoplasm, and 

 generally disorganized appearance of cells in B. 



(From photomicrographs, X 1640.) 



toxins and strychnin while under various forms of 

 anesthesia ; of animals given strychnin under anesthe- 

 sia and while under the influence of curare ; of animals 



