168 MAN --AN ADAPTIVE MECHANISM 



adrenals, the sex organs, the kidneys, the bone marrow, 

 the blood and the muscles. As compared with the cor- 

 responding tissues of normal animals, all these organs 



A. B. 



Section of normal liver of rabbit. Section of liver of rabbit after 



insomnia 100 hours. 



FIG. 26. PHOTOMICROGRAPHS SHOWING THE EFFECT OF INSOMNIA 100 

 HOURS ON THE LIVER OF A RABBIT. 



Compare A and B, noting the vacuolated spaces and general loss of cyto- 

 plasm in the latter. 



(From photomicrographs, X 1640.) 



and tissues were normal with three exceptions. The 

 brain, the adrenals and the liver alone showed 

 marked and widespread histologic changes as a result 



